BE374582A - - Google Patents

Info

Publication number: BE374582A
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.)

1930-02-21

Publication of BE374582A publication Critical patent/BE374582A/xx

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)
Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

BE374582D 1930-02-21 BE374582A (fr)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
GB5809/30A GB348716A (en)	1930-02-21	1930-02-21	Improvements in or relating to telephone transmitters

Publications (1)

Publication Number	Publication Date
BE374582A true BE374582A (fr)

Family

ID=9803011

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
BE374582D BE374582A (fr)	1930-02-21

Country Status (5)

Country	Link
US (1)	US1952889A (fr)
BE (1)	BE374582A (fr)
FR (1)	FR705756A (fr)
GB (1)	GB348716A (fr)
NL (1)	NL32162C (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US5181253A (en) *	1991-01-08	1993-01-19	Southern Audio Services, Inc.	Loudspeaker assembly
US7480209B2 (en) *	2007-05-29	2009-01-20	Harris Corporation	Submersible loudspeaker assembly

0
- NL NL32162D patent/NL32162C/xx active
- BE BE374582D patent/BE374582A/xx unknown
1930
- 1930-02-21 GB GB5809/30A patent/GB348716A/en not_active Expired
- 1930-11-04 FR FR705756D patent/FR705756A/fr not_active Expired
1931
- 1931-01-06 US US506890A patent/US1952889A/en not_active Expired - Lifetime

Also Published As

Publication number	Publication date
GB348716A (en)	1931-05-21
NL32162C (fr)
FR705756A (fr)	1931-06-12
US1952889A (en)	1934-03-27

Similar Documents

Publication	Publication Date	Title
FR741728A (fr)	1933-02-18
FR691497A (fr)	1930-10-22
FR675564A (fr)	1930-02-13
FR678473A (fr)	1930-03-22
FR675273A (fr)	1930-02-08
FR674017A (fr)	1930-02-24
FR674977A (fr)	1930-02-05
FR675588A (fr)	1930-02-13
FR684305A (fr)	1930-07-08
FR687752A (fr)	1930-09-12
FR35431E (fr)	1930-03-08
FR691832A (fr)	1930-10-25
FR695251A (fr)	1930-12-13
BE376461A (fr)
BE384321A (fr)
NL28106C (fr)
NL27439C (fr)
NL26995C (fr)
NL24982C (fr)
NL28828C (fr)
BE377623A (fr)	1931-03-31
BE380954A (fr)
NL29579C (fr)
NL31767C (fr)
NL32176C (fr)