GB251349A - Improvements in electric telephones - Google Patents

Improvements in electric telephones

Info

Publication number
GB251349A
GB251349A GB279725A GB279725A GB251349A GB 251349 A GB251349 A GB 251349A GB 279725 A GB279725 A GB 279725A GB 279725 A GB279725 A GB 279725A GB 251349 A GB251349 A GB 251349A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
telephones
electric
electric telephones
condensers
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
GB279725A
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
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 Individual filed Critical Individual
Priority to GB279725A priority Critical patent/GB251349A/en
Publication of GB251349A publication Critical patent/GB251349A/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
    • H04R19/00—Electrostatic transducers
    • H04R19/04—Microphones

Abstract

251,349. Walker, M. Jan. 31, 1925. Condensers.-A light diaphragm 1 is arranged between two perforated screens 2, 3, or close to one such screen. The diaphragm may consist of metal foil or a thin membrane coated with bronze powder or graphite. Specification 189,982 is referred to.
GB279725A 1925-01-31 1925-01-31 Improvements in electric telephones Expired GB251349A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB279725A GB251349A (en) 1925-01-31 1925-01-31 Improvements in electric telephones

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB279725A GB251349A (en) 1925-01-31 1925-01-31 Improvements in electric telephones

Publications (1)

Publication Number Publication Date
GB251349A true GB251349A (en) 1926-04-30

Family

ID=9746093

Family Applications (1)

Application Number Title Priority Date Filing Date
GB279725A Expired GB251349A (en) 1925-01-31 1925-01-31 Improvements in electric telephones

Country Status (1)

Country Link
GB (1) GB251349A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2864899A (en) * 1954-11-29 1958-12-16 Henry W Parker Transducer
US5015518A (en) * 1985-05-14 1991-05-14 Toyo Carbon Co., Ltd. Graphite body

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2864899A (en) * 1954-11-29 1958-12-16 Henry W Parker Transducer
US5015518A (en) * 1985-05-14 1991-05-14 Toyo Carbon Co., Ltd. Graphite body

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