HK37379A - Improvements in or relating to drawing instruments - Google Patents

Improvements in or relating to drawing instruments

Info

Publication number
HK37379A
HK37379A HK37379A HK37379A HK37379A HK 37379 A HK37379 A HK 37379A HK 37379 A HK37379 A HK 37379A HK 37379 A HK37379 A HK 37379A HK 37379 A HK37379 A HK 37379A
Authority
HK
Hong Kong
Prior art keywords
relating
drawing instruments
instruments
Prior art date
Application number
HK37379A
Original Assignee
Ha Wing Kwan
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 Ha Wing Kwan filed Critical Ha Wing Kwan
Publication of HK37379A publication Critical patent/HK37379A/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/56—Gauges for measuring angles or tapers, e.g. conical calipers
    • G01B3/563—Protractors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L7/00—Straightedges
    • B43L7/027—Plural non-adjustable straightedges fixed at right angles
    • B43L7/0275—Triangles

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Drawing Aids And Blackboards (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)
HK37379A 1975-09-30 1979-06-14 Improvements in or relating to drawing instruments HK37379A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4001775A GB1528473A (en) 1975-09-30 1975-09-30 Drawing instruments

Publications (1)

Publication Number Publication Date
HK37379A true HK37379A (en) 1979-06-22

Family

ID=10412754

Family Applications (1)

Application Number Title Priority Date Filing Date
HK37379A HK37379A (en) 1975-09-30 1979-06-14 Improvements in or relating to drawing instruments

Country Status (2)

Country Link
GB (1) GB1528473A (en)
HK (1) HK37379A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103568664A (en) * 2013-11-15 2014-02-12 南丹县大厂镇中心小学 Three-ply teaching aid

Also Published As

Publication number Publication date
GB1528473A (en) 1978-10-11

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