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battery beam blades blowlamp bulb burner burns called camera carpet carrier wave central heating central heating system circuit clock clockwork cooking cool cylinder Derailleur gears dial disc door drive belts drum elec electric current Electric motor electromagnets electronic feed film film gate fingerplate fitted float valve flow Flue fuel furnace fusebox gears gearwheels glass greenhouse grill handle heater Heating coil Heating element holes hot water inlet inside insulation iron kettle kind lamp lens lever light liquid lock machine magnetic metal microphone microwave oven Mortise lock moves movie projector needle outlet oven passes pedal piano picture pinion pipe plates plug plunger pointer pressure pulley pump push roller screw Shadow mask shaft slide socket sound speaker spin spool spray spring stove supply switch tank tape temperature thermostat thread tube turn valve vibrate washing Water Clocks window wire