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Moisture proof ballast construction for plastic signs and the like
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Fused coil having positive break
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Lead wire exit for electrical apparatus
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Parallel inverter having higher frequency at start-up
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Panel type display singn
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Stacking device for heavy cylindrical objects, such as wire reels
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Inverter having a single selfcommutating thyristor
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Phase control device
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Variable power supply
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Heat dissipating ballast construction embodying core clamp having coplanar spacer lugs
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Safety circuit for sequence start ballast with disconnect switches in the primary and secondary windings
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High reactance transformer
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Epoxy insulated transformer having tris-beta-chloroethylphosphate and hydrated alumina in the insulation
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Transformer ballast assembly for energizing gas discharge devices
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Plural lamp ballast
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Plural lamp ballast
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High reactance transformer
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Ballast and system for gaseous discharge lamps
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Method of making a waterproof transformer seal
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Transformer core and method of making same
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