- Grinding works
- Gunsmith's
- Hairdressing equipment
- Hairdressing supplies
- Handcraft supplies
- hardware
- Hearing aids
- Heating devices
- Heating installations
- Heating plants
- Heat pumps
- Heavy transport
- Helicopter flight services
- High-grade steel
- Holding companies
- Hot gas
- Household articles
- House management
- Hypnosis
- Ice cream parlors
- Industrial offices
- Inspection equipment
- Installation companies
- Installation materials
- Institutes
- Instrumentation technology
- Insulating glass
- insulation
- Insulation materials
- Insurance agents
- Intercom systems
- Interior decoration
- Interior installation
- Internet
- Internet providers
- Interpreters
- Investment consulting
- Iron
- Ironware
- Isolation
- IT solutions
- Jewelry goods
- Junior high schools
- Kennels
- Kitchens
- Labels
- Laboratory supplies
- Labor unions
- Law instituts
- Libraries
- Lighting
- Lighting domes
- Lighting systems
- Limousines
- Lohnverrechnung
- Lottery ticket shops
- Machine building
- Machine rental
- Machine repair
- Machine tool trade
- Magicians
- Management
- Manicurist
- Map offices
- Master builder
- Measuring devices
- Mediation
- Medical consulting
- Medical technology
- Meditation
- Men's fashion
- Metalworking plants
- Metal construction
- Metal working and processing
- Metal working shops
- Mining companies
- Model railways
- Mopeds
- Morticians
- Motorcycles
- Motorcycle clothing
- Motors
- Motorsports
- Motor boat driving schools
- Motor repair
- Mountaineering equipment
- Mountain railways
- Moving
- Multimedia
- Municipalities
- Music agents
- Music groups
- Music lessons
- Music publishers
- Music Therapy
- National parks
- Neon Advertising
- Notary publics
- Nurseries