CH513423A - Schreibprojektor - Google Patents

Schreibprojektor

Info

Publication number
CH513423A
CH513423A CH246771A CH246771A CH513423A CH 513423 A CH513423 A CH 513423A CH 246771 A CH246771 A CH 246771A CH 246771 A CH246771 A CH 246771A CH 513423 A CH513423 A CH 513423A
Authority
CH
Switzerland
Prior art keywords
writing projector
projector
writing
Prior art date
Application number
CH246771A
Other languages
German (de)
English (en)
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 CH513423A publication Critical patent/CH513423A/de

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L13/00—Drawing instruments, or writing or drawing appliances or accessories not otherwise provided for
    • B43L13/02—Draughting machines or drawing devices for keeping parallelism
    • B43L13/022—Draughting machines or drawing devices for keeping parallelism automatic

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Drawing Aids And Blackboards (AREA)
CH246771A 1970-04-09 1971-02-19 Schreibprojektor CH513423A (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19707013649 DE7013649U (de) 1970-04-09 1970-04-09 Schreibprojektor.

Publications (1)

Publication Number Publication Date
CH513423A true CH513423A (de) 1971-09-30

Family

ID=6610881

Family Applications (1)

Application Number Title Priority Date Filing Date
CH246771A CH513423A (de) 1970-04-09 1971-02-19 Schreibprojektor

Country Status (5)

Country Link
CH (1) CH513423A (2)
DE (1) DE7013649U (2)
DK (1) DK125937B (2)
FR (1) FR2083220A5 (2)
SE (1) SE371504B (2)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991000546A1 (en) * 1987-12-30 1991-01-10 Educatek Oy Overhead projector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991000546A1 (en) * 1987-12-30 1991-01-10 Educatek Oy Overhead projector
US5214459A (en) * 1987-12-30 1993-05-25 Educatek Oy Overhead projectors

Also Published As

Publication number Publication date
SE371504B (2) 1974-11-18
DE7013649U (de) 1970-08-20
DK125937B (da) 1973-05-21
FR2083220A5 (2) 1971-12-10

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