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DE479602C
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Circuit arrangement for optional calls from intercoms to company lines
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DE529890C
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Connection device for telephone systems with several exchange and extension lines
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GB262438A
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Improvements in or relating to telephone line selector installations
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DE568304C
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Telephone line dialing system for secret traffic with connection relay assigned to each intercom
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DE435970C
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Electric slave clock
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DE446552C
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Selector device for the optional setting of an impulse generator or a line selector
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DE446551C
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Dialing device with two different dials that can only be operated by a finger disc
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DE407252C
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Cable arrangement for selector in multiple circuit
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DE424092C
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Telephone system with hand dials
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DE450083C
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Circuit arrangement for telephone systems with call operation
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DE371245C
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Line selector for telephone systems
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DE379519C
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Circuit arrangement for group connection lines in independent telephone exchanges
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DE401385C
|
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Dialer for telephone systems
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DE363600C
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Circuit arrangement for telephone systems, especially for those with automatic call signals
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DE343442C
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Regulation device for synchronously running display units, especially for clocks
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DE340755C
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Contact lamella strips for multiple electors
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DE357020C
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Circuit arrangement for telephone systems with viewfinder operation
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DE331046C
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Step switch for self-connection telephones
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DE339263C
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Circuit arrangement for telephone systems with call seekers
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DE399151C
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Telephone system with electromechanically controlled switching devices
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