Alphabetical catalogue of branches - I
- Illuminating technique
- Image - consulting
- Imitation jewellery
- Import and export
- Impregnation of paving
- Indoor textiles
- Industrial automation
- Industrial buildings
- Industrial cleaning
- Industrial floors
- Industrial oils
- Industrial stoves
- Industrial supplies
- Informatics - consulting
- Information and documentation
- Information systems
- Infrared lamps
- Ink stencils
- Inline-skating schools
- Inspectorate, inspections
- Installation
- Instalment sale
- Instruments and supplies for measuring and surveying
- Insulating materials
- Insulating works
- Insulation
- Insurance - brokers, consulting
- Insurance, insurance companies
- Interiors
- Internet
- Internet - connection
- Internet - other services
- Internet administrators
- Internet advertisement
- Internet agencies
- Internet-service
- Investment consulting
- Iron
- Irrigation and draining devices
- Irrigation devices