GB513561A - Improvements in or relating to telephone transmitters - Google Patents

Improvements in or relating to telephone transmitters

Info

Publication number
GB513561A
GB513561A GB7816/39A GB781639A GB513561A GB 513561 A GB513561 A GB 513561A GB 7816/39 A GB7816/39 A GB 7816/39A GB 781639 A GB781639 A GB 781639A GB 513561 A GB513561 A GB 513561A
Authority
GB
United Kingdom
Prior art keywords
transmitter
sealing compound
casing
cement
grooves
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
GB7816/39A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB513561A publication Critical patent/GB513561A/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
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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 
    • H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  for microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Telephone Set Structure (AREA)
  • Specific Sealing Or Ventilating Devices For Doors And Windows (AREA)
GB7816/39A 1938-04-06 1938-04-06 Improvements in or relating to telephone transmitters Expired GB513561A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB237518X 1938-04-06

Publications (1)

Publication Number Publication Date
GB513561A true GB513561A (en) 1939-10-16

Family

ID=10200725

Family Applications (5)

Application Number Title Priority Date Filing Date
GB7816/39A Expired GB513561A (en) 1938-04-06 1938-04-06 Improvements in or relating to telephone transmitters
GB10565/38A Expired GB513529A (en) 1938-04-06 1938-04-06 Improvements in or relating to telephone transmitters
GB7815/39A Expired GB526212A (en) 1938-04-06 1939-03-10 Improvements in or relating to telephone transmitters
GB21035/45A Expired GB594116A (en) 1938-04-06 1944-08-15 Improvements in or relating to microphones
GB1277/45A Expired GB593082A (en) 1938-04-06 1945-01-16 Improvements in and relating to sliding bolts for doors and otherwise

Family Applications After (4)

Application Number Title Priority Date Filing Date
GB10565/38A Expired GB513529A (en) 1938-04-06 1938-04-06 Improvements in or relating to telephone transmitters
GB7815/39A Expired GB526212A (en) 1938-04-06 1939-03-10 Improvements in or relating to telephone transmitters
GB21035/45A Expired GB594116A (en) 1938-04-06 1944-08-15 Improvements in or relating to microphones
GB1277/45A Expired GB593082A (en) 1938-04-06 1945-01-16 Improvements in and relating to sliding bolts for doors and otherwise

Country Status (4)

Country Link
BE (1) BE433695A (cg-RX-API-DMAC10.html)
CH (1) CH237518A (cg-RX-API-DMAC10.html)
FR (1) FR852567A (cg-RX-API-DMAC10.html)
GB (5) GB513561A (cg-RX-API-DMAC10.html)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1025452B (de) * 1952-09-18 1958-03-06 Standard Elektrik Ag Elektroakustischer Wandler mit Helmholzreseonator
DE1012641B (de) * 1954-04-27 1957-07-25 Akg Akustische Kino Geraete Anordnung an Schallwandlern zur Glaettung der Frequenzcharakteristik
US2758861A (en) * 1954-11-12 1956-08-14 Arthur N Molloy Bolt lock
DE1147631B (de) * 1960-08-16 1963-04-25 Sennheiser Electronic Elektroakustischer Wandler
US4205206A (en) * 1975-10-31 1980-05-27 Iwatsu Electric Co. Ltd. Carbon granule microphone with molded resin-conductive carbon electrode
GB2203480A (en) * 1987-04-15 1988-10-19 Leslie Thomas Isaac Sliding bolt assembly

Also Published As

Publication number Publication date
CH237518A (fr) 1945-04-30
GB526212A (en) 1940-09-12
GB593082A (en) 1947-10-08
FR852567A (cg-RX-API-DMAC10.html) 1940-03-01
GB594116A (en) 1947-11-03
BE433695A (cg-RX-API-DMAC10.html)
GB513529A (en) 1939-10-16

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