NL55929C - - Google Patents

Info

Publication number
NL55929C
NL55929C NL55929DA NL55929C NL 55929 C NL55929 C NL 55929C NL 55929D A NL55929D A NL 55929DA NL 55929 C NL55929 C NL 55929C
Authority
NL
Netherlands
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 NL55929C publication Critical patent/NL55929C/xx
Priority to GB7809/30A priority Critical patent/GB350998A/en

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00Circuits for transducers, loudspeakers or microphones
    • H04R3/04Circuits for transducers, loudspeakers or microphones for correcting frequency response
    • H04R3/08Circuits for transducers, loudspeakers or microphones for correcting frequency response of electromagnetic transducers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B64AIRCRAFT; AVIATION; COSMONAUTICS
    • B64CAEROPLANES; HELICOPTERS
    • B64C27/00Rotorcraft; Rotors peculiar thereto
    • B64C27/02Gyroplanes
    • B64C27/021Rotor or rotor head construction
    • B64C27/026Devices for converting a fixed wing into an autorotation rotor and viceversa
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00Silicon; Compounds thereof
    • C01B33/20Silicates
    • C01B33/32Alkali metal silicates
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/12Gramophone pick-ups using a stylus; Recorders using a stylus
NL55929D 1930-03-10 NL55929C (xx)

Priority Applications (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
NL55929C true NL55929C (xx)

Family

ID=9840156

Family Applications (1)

Application Number Title Priority Date Filing Date
NL55929D NL55929C (xx) 1930-03-10

Country Status (4)

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

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
FR712887A (fr) 1931-10-14
US2024271A (en) 1935-12-17
BE377565A (xx)
FR712807A (fr) 1931-10-23

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