GB172291A - Telephone receiver - Google Patents

Telephone receiver

Info

Publication number
GB172291A
GB172291A GB30227/21A GB3022721A GB172291A GB 172291 A GB172291 A GB 172291A GB 30227/21 A GB30227/21 A GB 30227/21A GB 3022721 A GB3022721 A GB 3022721A GB 172291 A GB172291 A GB 172291A
Authority
GB
United Kingdom
Prior art keywords
core
shell
held
shellac
screws
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
GB30227/21A
Other languages
English (en)
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.)
WESTERN ELECTRIC CO Ltd
AT&T Corp
Original Assignee
WESTERN ELECTRIC CO Ltd
Western Electric Co Inc
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 WESTERN ELECTRIC CO Ltd, Western Electric Co Inc filed Critical WESTERN ELECTRIC CO Ltd
Publication of GB172291A publication Critical patent/GB172291A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
    • H04R13/02—Telephone receivers

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electromagnets (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
GB30227/21A 1920-12-02 1921-11-12 Telephone receiver Expired GB172291A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US427805A US1581509A (en) 1920-12-02 1920-12-02 bungerz

Publications (1)

Publication Number Publication Date
GB172291A true GB172291A (en) 1922-11-23

Family

ID=23696356

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30227/21A Expired GB172291A (en) 1920-12-02 1921-11-12 Telephone receiver

Country Status (3)

Country Link
US (1) US1581509A (fr)
FR (1) FR547572A (fr)
GB (1) GB172291A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE406405B (sv) * 1977-07-05 1979-02-05 Ericsson Telefon Ab L M Telefonapparat med en handmikrotelefon

Also Published As

Publication number Publication date
US1581509A (en) 1926-04-20
FR547572A (fr) 1922-12-19

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