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Priority to ES102439UpriorityCriticalpatent/ES102439Y/en
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Interconnected Communication Systems, Intercoms, And Interphones
(AREA)
Abstract
Calling device for doors that consists essentially of a box in which there are a loudspeaker and a microphone that are connected by corresponding circuits with complementary telephone devices located in each of the homes, these circuits being connected with respective selector switches arranged in the plate itself and that at the same time act on the corresponding calling devices. (Machine-translation by Google Translate, not legally binding)
ES102439U1963-10-311963-10-31
Door call device
ExpiredES102439Y
(en)
a CIRCUIT ARRANGEMENT FORTHE DETERMINATION OFTHE SERVICE CLASSIFICATION OF SUBSCRIBER STATIONS IN ELECTRONICALLY CONTROLLED TELEPHONE EXTENSION INSTALLATIONS
Improvements introduced in the telephone circuits that allow the warning of calls in occupied appliances or in conversation (Machine-translation by Google Translate, not legally binding)