FR318689A - Light signal system - Google Patents

Light signal system

Info

Publication number
FR318689A
FR318689A FR318689DA FR318689A FR 318689 A FR318689 A FR 318689A FR 318689D A FR318689D A FR 318689DA FR 318689 A FR318689 A FR 318689A
Authority
FR
France
Prior art keywords
light signal
signal system
light
signal
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
Duquesne
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR318689A publication Critical patent/FR318689A/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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR318689D 1902-02-14 1902-02-14 Light signal system Expired FR318689A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR318689T 1902-02-14

Publications (1)

Publication Number Publication Date
FR318689A true FR318689A (en) 1902-10-23

Family

ID=1369313

Family Applications (1)

Application Number Title Priority Date Filing Date
FR318689D Expired FR318689A (en) 1902-02-14 1902-02-14 Light signal system

Country Status (1)

Country Link
FR (1) FR318689A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1001311B (en) * 1953-11-30 1957-01-24 Siemens Ag Warning signal with a light source to secure unguarded railroad crossings

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1001311B (en) * 1953-11-30 1957-01-24 Siemens Ag Warning signal with a light source to secure unguarded railroad crossings
DE1001311C2 (en) * 1953-11-30 1957-06-27 Siemens Ag Warning signal with a light source to secure unguarded railroad crossings

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