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US2656418A
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Crossbar system switchboard unit mounting
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US2651683A
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Telephone subset wiring-plan system
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US2634403A
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Control and marking circuits for adding-type impulse counters
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US2647961A
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Multicontact relay
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US2608613A
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Mounting for a telephone substation ringer
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US2640183A
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Multipoint plug and jack
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US2590926A
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Multirelay electric timer
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US2574904A
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Endless chain of counting relays
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US2643365A
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Terminal pin block
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US2600729A
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Endless chain of counting relays
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US2611827A
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Crossbar switch
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US2587103A
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Path-selection control arrangement for primary-secondary switching systems
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US2627554A
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Crossbar system switchboard construction
|
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US2624785A
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Counting and registering relay circuit
|
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US2578032A
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Variable percussion hermetically sealed electromagnetic call-signal device
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US2643299A
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Selecting and actuating mechanism for crossbar switches
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US2571649A
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Telephone finger wheel support
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US2559715A
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Compression-connecting terminal member
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US2538819A
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Plural armature electromagnetic counting device
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US2538818A
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Electromagnetic counting device
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