FR566277A - Improvements to projection devices - Google Patents

Improvements to projection devices

Info

Publication number
FR566277A
FR566277A FR566277DA FR566277A FR 566277 A FR566277 A FR 566277A FR 566277D A FR566277D A FR 566277DA FR 566277 A FR566277 A FR 566277A
Authority
FR
France
Prior art keywords
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.)
HILGER Ltd ADAM
Original Assignee
HILGER Ltd ADAM
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 HILGER Ltd ADAM filed Critical HILGER Ltd ADAM
Application granted granted Critical
Publication of FR566277A publication Critical patent/FR566277A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/02—Viewing or reading apparatus
    • G02B27/08—Kaleidoscopes

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
FR566277D 1923-04-17 1923-05-16 Improvements to projection devices Expired FR566277A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB566277X 1923-04-17

Publications (1)

Publication Number Publication Date
FR566277A true FR566277A (en) 1924-02-12

Family

ID=10477113

Family Applications (1)

Application Number Title Priority Date Filing Date
FR566277D Expired FR566277A (en) 1923-04-17 1923-05-16 Improvements to projection devices

Country Status (1)

Country Link
FR (1) FR566277A (en)

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