Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB33392/28A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by IndividualfiledCriticalIndividual
Publication of GB300586ApublicationCriticalpatent/GB300586A/en
H04M1/00—Substation equipment, e.g. for use by subscribers
H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
Landscapes
Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
Audible And Visible Signals
(AREA)
Abstract
300,586. Hausdorf, E. Nov. 15, 1927, [Convention date]. Telephone systems and apparatus. - A substation is provided with an auxiliary receiver Hi for the use of deaf persons which is connected up through an amplifier R by means of contacts U1, U2 controlled by its switch-hook. The filament current and high tension are obtained from a lighting circuit through a contact K controlled by the relay Re, which is operated by the lighting current.