GB204084A - Improvements in telephone instrument circuits - Google Patents

Improvements in telephone instrument circuits

Info

Publication number
GB204084A
GB204084A GB1390522A GB1390522A GB204084A GB 204084 A GB204084 A GB 204084A GB 1390522 A GB1390522 A GB 1390522A GB 1390522 A GB1390522 A GB 1390522A GB 204084 A GB204084 A GB 204084A
Authority
GB
United Kingdom
Prior art keywords
microphone
automatic
ringer
hook
substation
Prior art date
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
GB1390522A
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.)
WILLIAM MILLER CROWE
Ericsson Telephones Ltd
Original Assignee
WILLIAM MILLER CROWE
Ericsson Telephones Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by WILLIAM MILLER CROWE, Ericsson Telephones Ltd filed Critical WILLIAM MILLER CROWE
Priority to GB1390522A priority Critical patent/GB204084A/en
Publication of GB204084A publication Critical patent/GB204084A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)

Abstract

204,084. British L. M. Ericsson Manufacturing Co., Ltd., and Crowe, W. M. May 17, 1922. Automatic, semi-automatic, and manual exchange systems.-To prevent an accidental clearing signal or release of the automatic switches when the microphone is in a horizontal position, the rise of the switch-hook at the substation is arranged to connect one or more coils of the ringer across the microphone, or a port of the speaking circuit including the microphone, or to short-circuit the condenser in series with the ringer. Fig. 2 shows an automatic substation in which the switch-hook S' on rising connects the bell B across the microphone M and receiver R. Specification 10602/06 is referred to.
GB1390522A 1922-05-17 1922-05-17 Improvements in telephone instrument circuits Expired GB204084A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1390522A GB204084A (en) 1922-05-17 1922-05-17 Improvements in telephone instrument circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1390522A GB204084A (en) 1922-05-17 1922-05-17 Improvements in telephone instrument circuits

Publications (1)

Publication Number Publication Date
GB204084A true GB204084A (en) 1923-09-17

Family

ID=10031500

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1390522A Expired GB204084A (en) 1922-05-17 1922-05-17 Improvements in telephone instrument circuits

Country Status (1)

Country Link
GB (1) GB204084A (en)

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