FR630518A - Reading tablet for abacuses - Google Patents

Reading tablet for abacuses

Info

Publication number
FR630518A
FR630518A FR630518DA FR630518A FR 630518 A FR630518 A FR 630518A FR 630518D A FR630518D A FR 630518DA FR 630518 A FR630518 A FR 630518A
Authority
FR
France
Prior art keywords
abacuses
reading tablet
tablet
reading
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
Georges Gregoire
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 FR630518A publication Critical patent/FR630518A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C17/00—Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
    • G01C17/02—Magnetic compasses
    • G01C17/04—Magnetic compasses with north-seeking magnetic elements, e.g. needles
    • G01C17/10—Comparing observed direction with north indication
    • G01C17/12—Comparing observed direction with north indication by sighting means, e.g. for surveyors' compasses

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR630518D 1927-03-08 1927-03-08 Reading tablet for abacuses Expired FR630518A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR630518T 1927-03-08

Publications (1)

Publication Number Publication Date
FR630518A true FR630518A (en) 1927-12-05

Family

ID=8991152

Family Applications (1)

Application Number Title Priority Date Filing Date
FR630518D Expired FR630518A (en) 1927-03-08 1927-03-08 Reading tablet for abacuses

Country Status (1)

Country Link
FR (1) FR630518A (en)

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