FR2187176A5 - - Google Patents

Info

Publication number
FR2187176A5
FR2187176A5 FR7220937A FR7220937A FR2187176A5 FR 2187176 A5 FR2187176 A5 FR 2187176A5 FR 7220937 A FR7220937 A FR 7220937A FR 7220937 A FR7220937 A FR 7220937A FR 2187176 A5 FR2187176 A5 FR 2187176A5
Authority
FR
France
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
FR7220937A
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.)
Gakken Holdings Co Ltd
Original Assignee
Gakken Co Ltd
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
Priority claimed from JP5837471U external-priority patent/JPS4945924Y2/ja
Priority claimed from JP11207471U external-priority patent/JPS4867703U/ja
Priority claimed from JP11621971U external-priority patent/JPS4871804U/ja
Application filed by Gakken Co Ltd filed Critical Gakken Co Ltd
Priority claimed from US00267992A external-priority patent/US3839601A/en
Application granted granted Critical
Publication of FR2187176A5 publication Critical patent/FR2187176A5/fr
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B5/00—Electrically-operated educational appliances
    • G09B5/06—Electrically-operated educational appliances with both visual and audible presentation of the material to be studied
    • G09B5/067—Combinations of audio and projected visual presentation, e.g. film, slides
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/0033—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with cards or other card-like flat carriers, e.g. flat sheets of optical film
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Business, Economics & Management (AREA)
  • Physics & Mathematics (AREA)
  • Educational Administration (AREA)
  • Educational Technology (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
FR7220937A 1971-07-06 1972-06-09 Expired FR2187176A5 (enrdf_load_stackoverflow)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP5837471U JPS4945924Y2 (enrdf_load_stackoverflow) 1971-07-06 1971-07-06
JP11207471U JPS4867703U (enrdf_load_stackoverflow) 1971-11-29 1971-11-29
JP11621971U JPS4871804U (enrdf_load_stackoverflow) 1971-12-10 1971-12-10
US00267992A US3839601A (en) 1971-07-06 1972-06-30 Optical record sheet and device for reproducing sound therefrom

Publications (1)

Publication Number Publication Date
FR2187176A5 true FR2187176A5 (enrdf_load_stackoverflow) 1974-01-11

Family

ID=27463645

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7220937A Expired FR2187176A5 (enrdf_load_stackoverflow) 1971-07-06 1972-06-09

Country Status (1)

Country Link
FR (1) FR2187176A5 (enrdf_load_stackoverflow)

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Legal Events

Date Code Title Description
ST Notification of lapse