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DE695160C
|
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Relay breaker
|
|
DE612483C
|
|
Arrangement for automatic switching on and off of electrical circuits, delayed by a mercury switch tube with a narrow flow opening
|
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DE558663C
|
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Toggle switch, especially for telephone systems
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GB287531A
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Improvements in or relating to circuits for operating electric clocks over telephone wires
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DE526403C
|
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Impulse generator for the operation of timers
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DE604711C
|
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Multiple brushes for self-connecting telephone systems
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DE467576C
|
|
Direction indicators
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DE493803C
|
|
Toggle switch tubes with separate outward and return paths for the contact means
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DE556317C
|
|
Circuit arrangement for operating and regulating electrical clocks via telephone lines
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