GB237997A - Improvements in telephone receivers - Google Patents

Improvements in telephone receivers

Info

Publication number
GB237997A
GB237997A GB1139624A GB1139624A GB237997A GB 237997 A GB237997 A GB 237997A GB 1139624 A GB1139624 A GB 1139624A GB 1139624 A GB1139624 A GB 1139624A GB 237997 A GB237997 A GB 237997A
Authority
GB
United Kingdom
Prior art keywords
telephone receivers
bawtree
mav
horn
door
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
GB1139624A
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.)
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 GB1139624A priority Critical patent/GB237997A/en
Priority to FR598466D priority patent/FR598466A/fr
Publication of GB237997A publication Critical patent/GB237997A/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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/30—Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Structure Of Receivers (AREA)
  • Radio Relay Systems (AREA)
  • Telephone Set Structure (AREA)
GB1139624A 1924-05-08 1924-05-08 Improvements in telephone receivers Expired GB237997A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1139624A GB237997A (en) 1924-05-08 1924-05-08 Improvements in telephone receivers
FR598466D FR598466A (fr) 1924-05-08 1925-05-08 Perfectionnements aux récepteurs téléphoniques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1139624A GB237997A (en) 1924-05-08 1924-05-08 Improvements in telephone receivers

Publications (1)

Publication Number Publication Date
GB237997A true GB237997A (en) 1925-08-10

Family

ID=9985456

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1139624A Expired GB237997A (en) 1924-05-08 1924-05-08 Improvements in telephone receivers

Country Status (2)

Country Link
FR (1) FR598466A (fr)
GB (1) GB237997A (fr)

Also Published As

Publication number Publication date
FR598466A (fr) 1925-12-17

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