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Protracting Parallel Rule

Auction:
2502
Lot:
723
Sold for:
$770$650

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Auction:
Clocks, Watches & Scientific Instruments - 2502
Location:
Marlborough
Date / Time :
May 01, 2010 10:00AM

Description:

Protracting Parallel Rule, William Helffricht, Philadelphia, the parallel rule with "S" hinges, lower section with engraved index, the upper engraved Wm. Helffricht Maker Philada, protractor engraved with degrees and index arm with vernier, maximum lg. 11 1/2 in.
Estimate $400-600

no significant repairs or replacements, instrument in old cleaned surface.

Keywords

Philadelphia, William Helffricht, Engraving, Protractor, Technical drawing