Heating equipment installation and repair; air conditioning apparatus installation and repair; boiler cleaning and repair; building construction; shipbuilding; electric appliance installation and repair; fire alarm installation and repair; building construction information; repair information in the field of heating and air conditioning equipment; installation of building insulation; damp-proofing buildings; machinery installation, maintenance and repair; painting; freezing equipment installation and repair; burglar alarm installation and repair; underwater repair; underwater construction

'air':6,40 'alarm':25,63 'apparatus':8 'applianc':20 'boiler':12 'build':16,29,45,50 'burglar':62 'clean':13 'condit':7,41 'construct':17,30,70 'damp':48 'damp-proof':47 'electr':19 'equip':2,42,58 'field':36 'fire':24 'freez':57 'heat':1,38 'inform':31,33 'instal':3,9,21,26,43,52,59,64 'insul':46 'machineri':51 'mainten':53 'paint':56 'proof':49 'repair':5,11,15,23,28,32,55,61,66,68 'shipbuild':18 'underwat':67,69

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