FR637793A - Improvement in magnification or projection devices - Google Patents

Improvement in magnification or projection devices

Info

Publication number
FR637793A
FR637793A FR637793DA FR637793A FR 637793 A FR637793 A FR 637793A FR 637793D A FR637793D A FR 637793DA FR 637793 A FR637793 A FR 637793A
Authority
FR
France
Prior art keywords
magnification
improvement
projection devices
projection
devices
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
Other languages
French (fr)
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.)
USINES PEARSON
Original Assignee
USINES PEARSON
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 USINES PEARSON filed Critical USINES PEARSON
Application granted granted Critical
Publication of FR637793A publication Critical patent/FR637793A/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
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/54—Lamp housings; Illuminating means
    • G03B27/545—Lamp housings; Illuminating means for enlargers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR637793D 1927-07-19 1927-07-19 Improvement in magnification or projection devices Expired FR637793A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR637793T 1927-07-19

Publications (1)

Publication Number Publication Date
FR637793A true FR637793A (en) 1928-05-08

Family

ID=8995560

Family Applications (1)

Application Number Title Priority Date Filing Date
FR637793D Expired FR637793A (en) 1927-07-19 1927-07-19 Improvement in magnification or projection devices

Country Status (1)

Country Link
FR (1) FR637793A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE745351C (en) * 1942-06-05 1944-03-31 Sigurd Gronow Process for the production of uniformly exposed photographic reproductions
DE953666C (en) * 1953-06-04 1956-12-06 Alfred Vogelsaenger Device for reproducing images in transmitted light

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE745351C (en) * 1942-06-05 1944-03-31 Sigurd Gronow Process for the production of uniformly exposed photographic reproductions
DE953666C (en) * 1953-06-04 1956-12-06 Alfred Vogelsaenger Device for reproducing images in transmitted light

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