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GB699883A - Improvements in or relating to telephone amplifiers - Google Patents

Improvements in or relating to telephone amplifiers

Info

Publication number
GB699883A
GB699883A GB25051/51A GB2505151A GB699883A GB 699883 A GB699883 A GB 699883A GB 25051/51 A GB25051/51 A GB 25051/51A GB 2505151 A GB2505151 A GB 2505151A GB 699883 A GB699883 A GB 699883A
Authority
GB
United Kingdom
Prior art keywords
telephone
relating
loud
oct
amplifier
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
GB25051/51A
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
Publication of GB699883A publication Critical patent/GB699883A/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
    • 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)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

699,883. Substation circuits. EPPLER, J., and BAROK, A. Oct. 26, 1951 [Oct. 27, 1950], No. 25051/51. Drawings to Specification. Class 40 (iv). A substation is provided with an amplifier and a four-position switch permitting normal use of the telephone, or amplified reception in the telephone receiver, or reproduction by a loud-speaker, or amplified reception in both the telephone receiver and the loud-speaker simultaneously, the power supply of the amplifier being separate from the telephone circuit.
GB25051/51A 1950-10-27 1951-10-26 Improvements in or relating to telephone amplifiers Expired GB699883A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR699883X 1950-10-27

Publications (1)

Publication Number Publication Date
GB699883A true GB699883A (en) 1953-11-18

Family

ID=9048441

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25051/51A Expired GB699883A (en) 1950-10-27 1951-10-26 Improvements in or relating to telephone amplifiers

Country Status (1)

Country Link
GB (1) GB699883A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2358604A (en) * 2000-12-12 2001-08-01 Richard Frederick Tanton Shears

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2358604A (en) * 2000-12-12 2001-08-01 Richard Frederick Tanton Shears
GB2358604B (en) * 2000-12-12 2002-03-20 Richard Frederick Tanton Shears

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