FR1001921A - Improvements to reading devices for microfilms - Google Patents

Improvements to reading devices for microfilms

Info

Publication number
FR1001921A
FR1001921A FR1001921DA FR1001921A FR 1001921 A FR1001921 A FR 1001921A FR 1001921D A FR1001921D A FR 1001921DA FR 1001921 A FR1001921 A FR 1001921A
Authority
FR
France
Prior art keywords
microfilms
reading devices
reading
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)
Inventor
Louis-Julien De Saint Rat
Raymond-Eugene Taurelle
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 filed Critical
Application granted granted Critical
Publication of FR1001921A publication Critical patent/FR1001921A/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
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/10—Projectors with built-in or built-on screen
    • G03B21/11—Projectors with built-in or built-on screen for microfilm reading

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR1001921D 1946-07-02 1946-07-02 Improvements to reading devices for microfilms Expired FR1001921A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1001921T 1946-07-02

Publications (1)

Publication Number Publication Date
FR1001921A true FR1001921A (en) 1952-02-29

Family

ID=9561665

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1001921D Expired FR1001921A (en) 1946-07-02 1946-07-02 Improvements to reading devices for microfilms

Country Status (1)

Country Link
FR (1) FR1001921A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3068747A (en) * 1957-08-07 1962-12-18 Garrison K Hall Finder for quickly locating a desired item in a long list of items

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3068747A (en) * 1957-08-07 1962-12-18 Garrison K Hall Finder for quickly locating a desired item in a long list of items

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