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DK9359C
(en)
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Device at Telephone exchanges.
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ES32684A1
(en)
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A telephone switchboard.
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DK7484C
(en)
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Telephone call counter.
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DK10963C
(en)
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Switchboard for Telephone exchanges.
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FR337643A
(en)
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Telephone counter
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DK8580C
(en)
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Device at Telephone exchanges with separate Plug operation.
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DK7259C
(en)
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Device by Telephone Systems.
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DK8219C
(en)
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Device at telephone exchanges, where connection is provided by separate plug contacts.
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DK7238C
(en)
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Device for Telephone Connections.
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DK6982C
(en)
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Calling device for several telephone sets on a double cable.
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DK4992C
(en)
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Device for Phones with Call Counter.
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FR344617A
(en)
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Switching system for telephone exchanges
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DK9378C
(en)
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Connecting device for use in the operation of telephone exchanges.
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DK5780C
(en)
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Apparatus for Counting Telephone Calls.
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ES37639A1
(en)
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A telephony procedure called a Thomson telephone system B.
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DK7839C
(en)
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Signal device for Telephone exchanges, where connection is provided by separate plug contacts.
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AT42118B
(en)
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Call counter circuit.
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DK5683C
(en)
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Switching device for several call stations located on one line.
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AT24623B
(en)
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Telephone relay.
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DK8915C
(en)
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Device by Microphones.
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DK8261C
(en)
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Device by Microphones.
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AT23494B
(en)
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Call counters for telephone exchanges.
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CH31509A
(en)
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Telephone system
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CH30654A
(en)
|
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Telephone system
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AT25443B
(en)
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Automatic telephone switch.
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