Drilling, turning, countersinking, shaving, planing, lapping, broach, dressing, sawing, grinding, sharpening, etc. of metallic pieces
Repair and maintenance of house boilers
Installation of secondary power supply systems (electrical generators)
Building of transport and distribution lines for electricity
Setting of electric cables and appliances
Setting of monitoring systems and alarms against housebreakings
Installation in buildings or in other projects of building of: heating systems by electricity, gas and fuel, boilers, materials and pipes for ventilation and air conditioning, etc.
Setting of electrical installations of heating
Assembling of inside and outside woordworks: doors, windows, closets of equipped kitchens, shop equipments, frames for windows and doors, etc.
Assembling of greenhouses, verandas, etc.
Assembling of inside and outside metallic woordworks: doors, windows, frames for windows and doors, stairs, closets for equipped kitchens, shop equipments, etc.
Assembling of metallic greenhouses, verandas, etc.
Installation of inside doors, partitions,... in glass
Setting of glasses, mirrors, etc.
Installation of industrial machines, devices and equipment
Installation of heating, air-conditioning and ventilation
Carpentry
Laying of floor and wall tiles
Do-it-yourself businesses and d.i.y. shops of common building materials
Retail trade in floor and wall-tiles in specialised shops
Trade in own real estate
Electro-technical installation works, with the exception of those executed at buildings
Plumbing works
Mediation for purchase, sale and rental of real estate, this for a fixed amount or by means of a contract
Wholesale in electronic materials, inclusive of material for installation
Wholesale in installation materials used by plumbers and for the installation of heating