Compass spring arc millimeters in thickness
 

Graduation sharp and precise. Engraved on the brass industry. Reading 1 / 10 mm. A division = 0.1 mm aperture of the tip of the compass. Steel frame with quick-closing spring.
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ART. 1920 opening mm 10 -
ART. 1930 opening mm 15 -
ART. 1940 opening mm 20 -

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