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Variable resistor
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Method of making variable resistance units
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Display cabinet
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Adjustable resistance device
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Variable resistance device
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Electrical resistance unit
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Rheostat-lamp socket
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Lamp socket rheostat
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Variable resistance device
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Current regulator for electric lamps
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Resistance unit
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Current regulator for electric lamps
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Lightning arrester
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Rheostat fixture for electric lights
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Electric-lamp-fixture mounting
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Adjustable electromagnetic unit
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Acoustic device
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Current regulator for electric lamps
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Lamp-socket rheostat
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Lamp fixture
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