Engineering activities for technical building equipment companies in Mülheim an der Ruhr

Mülheim an der Ruhr ·Currently listed companies in the Engineering activities for technical building equipment industry headquartered in Mülheim an der Ruhr.

32 companies · 1–20 of 32

Aquatechnik Gesellschaft für Hydrogeologie und Umweltschutz mbH GmbH · HRB 5777 Duisburg · 2002
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ARUMtech GmbH GmbH · HRB 30568 Duisburg · 2018
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Ballhausen Ingenieurgesellschaft mbH GmbH · HRB 17989 Duisburg · 2000
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BESTeam-CAD GmbH GmbH · HRB 33202 Duisburg · 2020
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Bluemetals GmbH GmbH · HRB 31642 Duisburg · 2019
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BüKo Ingenieurbüro für Gebäudeautomation GmbH GmbH · HRB 34904 Duisburg · 2021
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DBS Ingenieure GmbH GmbH · HRB 22198 Duisburg · 2010
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Doaro Energie UG (haftungsbeschränkt) UG (haftungsbeschränkt) · HRB 24365 Duisburg · 2012
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Einfach BAUEN GmbH GmbH · HRB 33029 Duisburg · 2020
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Elomech Elektroanlagen GmbH GmbH · HRB 15707 Duisburg · 2004
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Energie-Beratung Ruhr UG (haftungsbeschränkt) UG (haftungsbeschränkt) · HRB 36461 Duisburg · 2023
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FLID Unternehmergesellschaft (haftungsbeschränkt) UG (haftungsbeschränkt) · HRB 26005 Duisburg · 2013
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Gebäudetechnik Wessel GmbH GmbH · HRB 28659 Duisburg · 2016
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Hans-Günther Jacobs Ingenieur GmbH GmbH · HRB 14593 Duisburg · 2004
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HTS GmbH GmbH · HRB 15762 Duisburg · 2004
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HYDRO-ENGINEERING GmbH GmbH · HRB 14692 Duisburg · 2004
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IBG Ingenieurbüro für Bühnentechnik UG (haftungsbeschränkt) UG (haftungsbeschränkt) · HRB 33971 Duisburg · 2012
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ide-Ingenieur- Dienstleistungs- GmbH GmbH · HRB 15876 Duisburg · 2004
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IJW-Ingenieurgesellschaft Jürgen Weindt mbH GmbH · HRB 14859 Duisburg · 2004
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ing4LAB Ingenieurgesellschaft für Labor- und Werkstattplanung mbH GmbH · HRB 26523 Duisburg · 2014
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All industries in Mülheim an der Ruhr

Live API

GEThandelsregister.ai/api/v1/search-organizations

?limit=20

&filters={"city":"Mülheim an der Ruhr","industry_code":"71.12.3","industry_scheme":"WZ2025"}

# pip install handelsregister
from handelsregister import Handelsregister

client = Handelsregister(api_key="YOUR_API_KEY")  # or set HANDELSREGISTER_API_KEY
page = client.search_organizations(
    filters={
        "city": "Mülheim an der Ruhr",
        "industry_code": "71.12.3",
        "industry_scheme": "WZ2025"
    },
    limit=20,
    skip=0,
)
print(page["total"])
for item in page["results"]:
    print(item["name"], item["registration"]["register_number"])

// npm install handelsregister
import { Handelsregister } from 'handelsregister';

const client = new Handelsregister('YOUR_API_KEY'); // or set HANDELSREGISTER_API_KEY
const page = await client.searchOrganizations({
  filters: {
      "city": "Mülheim an der Ruhr",
      "industry_code": "71.12.3",
      "industry_scheme": "WZ2025"
  },
  limit: 20,
  skip: 0,
});
console.log(page.total);
for (const item of page.results) {
  console.log(item.name, item.registration.register_number);
}

// npm install handelsregister
const { Handelsregister } = require('handelsregister');

const client = new Handelsregister(process.env.HANDELSREGISTER_API_KEY);
(async () => {
  const page = await client.searchOrganizations({
    filters: {
        "city": "Mülheim an der Ruhr",
        "industry_code": "71.12.3",
        "industry_scheme": "WZ2025"
    },
    limit: 20,
    skip: 0,
  });
  console.log(page.total);
  for (const item of page.results) {
    console.log(item.name, item.registration.register_number);
  }
})();

curl 'https://handelsregister.ai/api/v1/search-organizations?limit=20' \
  -H 'x-api-key: YOUR_API_KEY' \
  -G --data-urlencode 'filters={"city":"Mülheim an der Ruhr","industry_code":"71.12.3","industry_scheme":"WZ2025"}'

{
    "results": [
        {
            "entity_id": "<32-char hex>",
            "name": "<string>",
            "registration": {
                "court": "<string>",
                "register_type": "<string>",
                "register_number": "<string>"
            },
            "address": {
                "house_number": "<string>",
                "street": "<string>",
                "postal_code": "<string>",
                "city": "<string>",
                "county": "<string>",
                "state": "<string>",
                "country": "<ISO country>",
                "coordinates": {
                    "latitude": "<float>",
                    "longitude": "<float>"
                }
            },
            "registration_date": "<ISO date>",
            "purpose": "<string>"
        }
    ],
    "total": "<int>",
    "meta": {
        "request_credit_cost": "<int>",
        "credits_remaining": "<int>"
    }
}

results[]

entity_id string

Stable 32-char hex identifier. Pass straight into /fetch-organization as `q`.

name string

Registered company name.

registration object

address object

Postal address with street, house_number, postal_code, city, county, state, country and coordinates (latitude/longitude).

registration_date date

Initial entry into the commercial register (ISO date).

purpose string

Stated business purpose (Unternehmensgegenstand).

top-level

total integer

Total result count for pagination.

meta.request_credit_cost integer

Credits actually charged for this call.

meta.credits_remaining integer

Account credit balance remaining after this call.

Location · Industry · Legal form · Full-text

Filters & master data — via search-organizations

City, industry, legal form, registration date: every argument combinable through the filters parameter. One REST endpoint, every German company.

Location & geo Filter by city, postal code, state and county through city, postal_code, state and county.
Industry (WZ2025) Industry segmentation via the official WZ2025 codes — industry_code combined with industry_scheme.
Legal form GmbH, AG, KG, OHG and more via legal_form_code.
Company size bs_company_size_category – small, medium, large based on balance-sheet totals.
Active status Restrict to active entries or include deleted companies via active.
Registration date Date ranges via registration_date_from and registration_date_to.
Full-text search Free-text query via the q parameter (min. 2 characters).
Pagination skip and limit (up to 30 results per call) for deep lists.
Master data per result entity_id, name, address, registration and registration_date – pass entity_id straight to /fetch-organization.

Run every filter live with an API key. Get an API key →

Code · AI-Agents · No-Code · Workflows

Drops into any stack

The search-organizations API speaks every mainstream client: REST, Python, Node, MCP for AI agents, n8n and webhook platforms.

REST API Simple GET request with the X-API-KEY header and JSON-encoded filters. Python requests, httpx or your favourite library — pass filters via json.dumps. Node.js fetch or axios with URLSearchParams. Works in edge, worker and browser runtimes. MCP Server Directly in Claude, Cursor or any MCP-aware AI client as the search_organizations tool. n8n Pre-built custom node for workflow automation — city, industry and size as filter inputs. Webhook Callable from Zapier, Make or any other webhook platform.

This list in your app

Grab an API key and filter every German company by city, industry, size and more — straight from your application. One REST endpoint, every result.

Get an API key

Filters & master data — via search-organizations

Drops into any stack

This list in your app

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