GB353439A - - Google Patents

Info

Publication number
GB353439A
GB353439A GB1249030A GB1249030A GB353439A GB 353439 A GB353439 A GB 353439A GB 1249030 A GB1249030 A GB 1249030A GB 1249030 A GB1249030 A GB 1249030A GB 353439 A GB353439 A GB 353439A
Authority
GB
United Kingdom
Prior art keywords
frame
electrode
diaphragm
diaphragms
kinematograph
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
GB1249030A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB353439A publication Critical patent/GB353439A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/565—Screens allowing free passage of sound

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
GB1249030A 1929-04-22 1930-04-22 Expired GB353439A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US353439X 1929-04-22

Publications (1)

Publication Number Publication Date
GB353439A true GB353439A (fr) 1931-07-22

Family

ID=21882084

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1249030A Expired GB353439A (fr) 1929-04-22 1930-04-22

Country Status (1)

Country Link
GB (1) GB353439A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999060444A1 (fr) * 1998-05-15 1999-11-25 Harman Audio Electronic Systems Gmbh Ecran de projection

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999060444A1 (fr) * 1998-05-15 1999-11-25 Harman Audio Electronic Systems Gmbh Ecran de projection
US6369943B1 (en) 1998-05-15 2002-04-09 Harman Audio Electronic Systems Gmbh Projection screen

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