NL7212063A - - Google Patents

Info

Publication number
NL7212063A
NL7212063A NL7212063A NL7212063A NL7212063A NL 7212063 A NL7212063 A NL 7212063A NL 7212063 A NL7212063 A NL 7212063A NL 7212063 A NL7212063 A NL 7212063A NL 7212063 A NL7212063 A NL 7212063A
Authority
NL
Netherlands
Application number
NL7212063A
Inventor
G Ritzerfeld
Original Assignee
Ritzerfeld Gerhard
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 Ritzerfeld Gerhard filed Critical Ritzerfeld Gerhard
Publication of NL7212063A publication Critical patent/NL7212063A/xx

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS 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
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/132Overhead projectors, i.e. capable of projecting hand-writing or drawing during action

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Drawing Aids And Blackboards (AREA)
NL7212063A 1971-10-22 1972-09-05 NL7212063A (enExample)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19717140691 DE7140691U (de) 1971-10-22 1971-10-22 Arbeitsplatte bzw. schreibplatte fuer einen schreibprojektor

Publications (1)

Publication Number Publication Date
NL7212063A true NL7212063A (enExample) 1973-04-25

Family

ID=6624769

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7212063A NL7212063A (enExample) 1971-10-22 1972-09-05

Country Status (7)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5879731U (ja) * 1981-11-26 1983-05-30 ソニー株式会社 リアプロジエクタ装置

Also Published As

Publication number Publication date
BE788185A (fr) 1972-12-18
DE7140691U (de) 1972-01-27
FR2157559A5 (enExample) 1973-06-01
SE374437B (enExample) 1975-03-03
CH541819A (de) 1973-09-15
GB1363026A (en) 1974-08-14

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