FR2157559A5 - - Google Patents

Info

Publication number
FR2157559A5
FR2157559A5 FR7236868A FR7236868A FR2157559A5 FR 2157559 A5 FR2157559 A5 FR 2157559A5 FR 7236868 A FR7236868 A FR 7236868A FR 7236868 A FR7236868 A FR 7236868A FR 2157559 A5 FR2157559 A5 FR 2157559A5
Authority
FR
France
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
FR7236868A
Other languages
French (fr)
Inventor
G Ritzerfeld
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
Application granted granted Critical
Publication of FR2157559A5 publication Critical patent/FR2157559A5/fr
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
    • G03B21/132—Overhead projectors, i.e. capable of projecting hand-writing or drawing during action

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Drawing Aids And Blackboards (AREA)
  • Overhead Projectors And Projection Screens (AREA)
FR7236868A 1971-10-22 1972-10-18 Expired FR2157559A5 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19717140691 DE7140691U (en) 1971-10-22 1971-10-22 WORKTOP OR WRITING PLATE FOR A WRITING PROJECTOR

Publications (1)

Publication Number Publication Date
FR2157559A5 true FR2157559A5 (en) 1973-06-01

Family

ID=6624769

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7236868A Expired FR2157559A5 (en) 1971-10-22 1972-10-18

Country Status (7)

Country Link
BE (1) BE788185A (en)
CH (1) CH541819A (en)
DE (1) DE7140691U (en)
FR (1) FR2157559A5 (en)
GB (1) GB1363026A (en)
NL (1) NL7212063A (en)
SE (1) SE374437B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2517083A1 (en) * 1981-11-26 1983-05-27 Sony Corp RETROPROJECTION APPARATUS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2517083A1 (en) * 1981-11-26 1983-05-27 Sony Corp RETROPROJECTION APPARATUS

Also Published As

Publication number Publication date
CH541819A (en) 1973-09-15
DE7140691U (en) 1972-01-27
SE374437B (en) 1975-03-03
NL7212063A (en) 1973-04-25
GB1363026A (en) 1974-08-14
BE788185A (en) 1972-12-18

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Legal Events

Date Code Title Description
ST Notification of lapse