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CA2114041A1
(en)
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Method and apparatus for detecting and responding to events occurring on a remote telephone
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US5535264A
(en)
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Prompt issuing protocol for an intercept voice messaging system
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US4027109A
(en)
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Telephone call diverting system
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US2729703A
(en)
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Telephone paystation
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US2801287A
(en)
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Control of regular and distant talking subscribers sets
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SU167535A1
(enrdf_load_stackoverflow)
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US3660609A
(en)
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Subscriber long line extender
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US2137409A
(en)
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Substation telephone circuit
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CA1206651A
(en)
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Telephone substation transmitter muting circuit
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US3920902A
(en)
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Off-premises station line circuit for a key telephone system
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JPS59208965A
(ja)
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電話機の呼出方式
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US2041964A
(en)
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Telephone system
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US4748657A
(en)
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Handset actuated signal intercept
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US2885477A
(en)
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Exclusion arrangement for loudspeaking telephone systems
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US2993092A
(en)
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Transistor amplifiers for relays to extend telephone exchange signalling limits
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SU291367A1
(ru)
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Монетный телефонный аппарат
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KR20080110475A
(ko)
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대표전화 장치 및 이를 이용한 대표전화 구현방법
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US3366745A
(en)
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Remote telephone extension system
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CA1109173A
(en)
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Singing preventive system
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US3553373A
(en)
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Manual rerouter system for telephone subscriber station with combined conference call feature
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SU259169A1
(ru)
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Телефонный аппарат
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US3536851A
(en)
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Restricted telephone station set
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US2214212A
(en)
|
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Telephone substation
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RU2066927C1
(ru)
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Устройство для подключения двух телефонных абонентов к одной абонентской линии
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GB2120043A
(en)
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Solid state voice generating system
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