Stamps, engineering symbols design

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Canada

postage

1987, May 19 Engineering Institute of Canada 100th issue unwmk p. 12.5x13
Colnect-1017-568-Engineering-1887-1987.jpg
X 36 multi engineering symbols

Sweden


1963, May 27
Colnect-4297-298-Industry.jpgColnect-4297-297-Industry.jpgColnect-4297-299-Industry.jpg
X 50o gray engineering symbols, p. *s3
X 50o gray engineering symbols, p. *v
X 1.05kr org engineering symbols, p. *v

1 to 4 of 4