BE377565A - - Google Patents

Info

Publication number
BE377565A
BE377565A BE377565DA BE377565A BE 377565 A BE377565 A BE 377565A BE 377565D A BE377565D A BE 377565DA BE 377565 A BE377565 A BE 377565A
Authority
BE
Belgium
Application number
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.)
Publication of BE377565A publication Critical patent/BE377565A/xx
Priority claimed from GB7809/30A external-priority patent/GB350998A/en

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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
    • H04R3/08—Circuits for transducers, loudspeakers or microphones for correcting frequency response of electromagnetic transducers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C27/00—Rotorcraft; Rotors peculiar thereto
    • B64C27/02—Gyroplanes
    • B64C27/021—Rotor or rotor head construction
    • B64C27/026—Devices for converting a fixed wing into an autorotation rotor and viceversa
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/20—Silicates
    • C01B33/32—Alkali metal silicates
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/12—Gramophone pick-ups using a stylus; Recorders using a stylus

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Electromagnetism (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
BE377565D 1930-03-10 BE377565A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7809/30A GB350998A (en) 1930-03-10 1930-03-10 Improvements in apparatus for recording sounds upon wax or other like discs or blanks

Publications (1)

Publication Number Publication Date
BE377565A true BE377565A (fr)

Family

ID=9840156

Family Applications (1)

Application Number Title Priority Date Filing Date
BE377565D BE377565A (fr) 1930-03-10

Country Status (4)

Country Link
US (1) US2024271A (fr)
BE (1) BE377565A (fr)
FR (2) FR712807A (fr)
NL (1) NL55929C (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2773130A (en) * 1953-03-31 1956-12-04 Rca Corp Acoustical resistance for pressure type microphones

Also Published As

Publication number Publication date
NL55929C (fr)
FR712807A (fr) 1931-10-23
FR712887A (fr) 1931-10-14
US2024271A (en) 1935-12-17

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