BE460220A - - Google Patents

Info

Publication number
BE460220A
BE460220A BE460220DA BE460220A BE 460220 A BE460220 A BE 460220A BE 460220D A BE460220D A BE 460220DA BE 460220 A BE460220 A BE 460220A
Authority
BE
Belgium
Prior art keywords
rule
emi
ruler
protractor
air bubble
Prior art date
Application number
Other languages
English (en)
French (fr)
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.)
Publication of BE460220A publication Critical patent/BE460220A/fr

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00Measuring instruments characterised by the use of mechanical techniques
    • G01B3/02Rulers with scales or marks for direct reading
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B43WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43LARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L13/00Drawing instruments, or writing or drawing appliances or accessories not otherwise provided for
    • B43L13/02Draughting machines or drawing devices for keeping parallelism
    • B43L13/08Protractor heads
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B43WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43LARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L7/00Straightedges
    • B43L7/005Straightedges combined with other drawing aids

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)
  • Drawing Aids And Blackboards (AREA)
BE460220D 1945-02-13 BE460220A (2)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR909224T 1945-02-13

Publications (1)

Publication Number Publication Date
BE460220A true BE460220A (2)

Family

ID=9407778

Family Applications (1)

Application Number Title Priority Date Filing Date
BE460220D BE460220A (2) 1945-02-13

Country Status (2)

Country Link
BE (1) BE460220A (2)
FR (1) FR909224A (2)

Also Published As

Publication number Publication date
FR909224A (fr) 1946-05-02

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