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Mechanical Dashed Line Instrument (30792308351)

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Mechanical Dashed Line Instrument (30792308351)

description

Summary

The three notched discs and a drafting pen mounted on the spring-loaded base created different dash-line patterns for boundary, road, river, and other linear map symbols.

date_range

Date

09/11/2016
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Source

Mechanical Dashed Line Instrument
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