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GB191122049A
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Improvements in or relating to Telephone Transmitters.
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CA145729A
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Solder for electric conduits, etc.
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US1067415A
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Soldering-body for joining electric conduits or the like.
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US1042772A
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Carbon-grain cells of telephone-transmitters.
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US999019A
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Cooling device for telephone-transmitters.
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CA129668A
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Cooling device for telephone transmitters
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GB191008019A
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Improvements in or relating to Cooling Devices for Telephone Transmitters.
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GB191007656A
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Improvements in or relating to Cooling Devices for Telephone Transmitters.
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US1068871A
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Cooling device for telephone-transmitters for strong current.
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US1023557A
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Multiple telephone-transmitter.
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US989588A
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Cooling device for telephone-transmitter.
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GB190912918A
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Improvements in or relating to Telephone-transmitters.
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US938992A
|
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Telephone-transmitter.
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GB190826053A
|
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Improvements in Aerial Electric Cables
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US960291A
|
|
Aerial electric cable.
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GB190806587A
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Improvements in or relating to Microphones and the like.
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CA117607A
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Means of fastening and insulating the supports of electrical conductors
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|
GB190626290A
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Improvements in Methods of and Means for Insulating the Supports of Electric Conductors.
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US875902A
|
|
Means for insulating the supports of electric conduits.
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GB190411267A
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Toy Building Blocks.
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