GB308449A - Improvements relating to telephone instruments - Google Patents

Improvements relating to telephone instruments

Info

Publication number
GB308449A
GB308449A GB727528A GB727528A GB308449A GB 308449 A GB308449 A GB 308449A GB 727528 A GB727528 A GB 727528A GB 727528 A GB727528 A GB 727528A GB 308449 A GB308449 A GB 308449A
Authority
GB
United Kingdom
Prior art keywords
reinforced
strips
improvements relating
powdered
telephone instruments
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
GB727528A
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.)
CHARLES FREDERIC MARCHANT HAYE
Mullard Radio Valve Co Ltd
Original Assignee
CHARLES FREDERIC MARCHANT HAYE
Mullard Radio Valve Co 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
Priority to BE358487D priority Critical patent/BE358487A/xx
Application filed by CHARLES FREDERIC MARCHANT HAYE, Mullard Radio Valve Co Ltd filed Critical CHARLES FREDERIC MARCHANT HAYE
Priority to GB727528A priority patent/GB308449A/en
Priority to FR670618D priority patent/FR670618A/fr
Publication of GB308449A publication Critical patent/GB308449A/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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/14—Non-planar diaphragms or cones corrugated, pleated or ribbed

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
GB727528A 1928-03-08 1928-03-08 Improvements relating to telephone instruments Expired GB308449A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE358487D BE358487A (https=) 1928-03-08
GB727528A GB308449A (en) 1928-03-08 1928-03-08 Improvements relating to telephone instruments
FR670618D FR670618A (fr) 1928-03-08 1929-02-28 Organes vibrants particulièrement destinés aux microphones, hauts parleurs et autres dispositifs analogues

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB727528A GB308449A (en) 1928-03-08 1928-03-08 Improvements relating to telephone instruments

Publications (1)

Publication Number Publication Date
GB308449A true GB308449A (en) 1929-03-28

Family

ID=9829965

Family Applications (1)

Application Number Title Priority Date Filing Date
GB727528A Expired GB308449A (en) 1928-03-08 1928-03-08 Improvements relating to telephone instruments

Country Status (3)

Country Link
BE (1) BE358487A (https=)
FR (1) FR670618A (https=)
GB (1) GB308449A (https=)

Also Published As

Publication number Publication date
FR670618A (fr) 1929-12-02
BE358487A (https=)

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