Carrier wave facility; electricity meter; electric measure manostat; printed circuits; chips [integrated circuits]; mono-crystalline silicon; electronic chip; silicon epitaxial wafers; wafers [silicon slices]; low voltage power supply; stable electrical source; step-up transformers; protectors (voltage surge -); inverters [electricity]; couplings, electric; collectors, electric; printed circuit boards; transformers [electricity]; semi-conductors; integrated circuits; galena crystals [detectors]; commutation (electric apparatus for -); power station automatization equipment; alarms (fire -); smoke detectors