CH528750A - Overhead projector - Google Patents

Overhead projector

Info

Publication number
CH528750A
CH528750A CH246971A CH246971A CH528750A CH 528750 A CH528750 A CH 528750A CH 246971 A CH246971 A CH 246971A CH 246971 A CH246971 A CH 246971A CH 528750 A CH528750 A CH 528750A
Authority
CH
Switzerland
Prior art keywords
overhead projector
projector
overhead
Prior art date
Application number
CH246971A
Other languages
German (de)
Inventor
Ritzerfeld Gerhard
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 CH528750A publication Critical patent/CH528750A/en

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)
  • Projection Apparatus (AREA)
CH246971A 1970-04-09 1971-02-19 Overhead projector CH528750A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19707013647 DE7013647U (en) 1970-04-09 1970-04-09 DAYLIGHT PROJECTOR.

Publications (1)

Publication Number Publication Date
CH528750A true CH528750A (en) 1972-09-30

Family

ID=6610880

Family Applications (1)

Application Number Title Priority Date Filing Date
CH246971A CH528750A (en) 1970-04-09 1971-02-19 Overhead projector

Country Status (5)

Country Link
CH (1) CH528750A (en)
DE (1) DE7013647U (en)
DK (1) DK126878B (en)
FR (1) FR2083273A5 (en)
SE (1) SE371301B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3241956A1 (en) * 1982-11-12 1984-05-17 Demolux Gmbh & Co Kg, 6070 Langen Steel projector

Also Published As

Publication number Publication date
FR2083273A5 (en) 1971-12-10
DK126878B (en) 1973-08-27
DE7013647U (en) 1970-08-20
SE371301B (en) 1974-11-11

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