GB522226A - Improvements in or relating to telephone transmitters - Google Patents

Improvements in or relating to telephone transmitters

Info

Publication number
GB522226A
GB522226A GB3596738A GB3596738A GB522226A GB 522226 A GB522226 A GB 522226A GB 3596738 A GB3596738 A GB 3596738A GB 3596738 A GB3596738 A GB 3596738A GB 522226 A GB522226 A GB 522226A
Authority
GB
United Kingdom
Prior art keywords
electrode
bellows
extension
annular
secured
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
GB3596738A
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.)
FREDERIC GUILLAUME FRIEBEL
Original Assignee
FREDERIC GUILLAUME FRIEBEL
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 NL57484D priority Critical patent/NL57484C/xx
Priority to BE437314D priority patent/BE437314A/xx
Application filed by FREDERIC GUILLAUME FRIEBEL filed Critical FREDERIC GUILLAUME FRIEBEL
Priority to GB3596738A priority patent/GB522226A/en
Publication of GB522226A publication Critical patent/GB522226A/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
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H04R21/021—Microphones with granular resistance material

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
GB3596738A 1938-12-09 1938-12-09 Improvements in or relating to telephone transmitters Expired GB522226A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL57484D NL57484C (enrdf_load_stackoverflow) 1938-12-09
BE437314D BE437314A (enrdf_load_stackoverflow) 1938-12-09
GB3596738A GB522226A (en) 1938-12-09 1938-12-09 Improvements in or relating to telephone transmitters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3596738A GB522226A (en) 1938-12-09 1938-12-09 Improvements in or relating to telephone transmitters

Publications (1)

Publication Number Publication Date
GB522226A true GB522226A (en) 1940-06-12

Family

ID=10383468

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3596738A Expired GB522226A (en) 1938-12-09 1938-12-09 Improvements in or relating to telephone transmitters

Country Status (3)

Country Link
BE (1) BE437314A (enrdf_load_stackoverflow)
GB (1) GB522226A (enrdf_load_stackoverflow)
NL (1) NL57484C (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
NL57484C (enrdf_load_stackoverflow)
BE437314A (enrdf_load_stackoverflow)

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