Chalk line apparatus
作者： Frank A. Dehn
DOI:
关键词:
摘要: A chalk line apparatus comprising a holder for powdered containing rotatable reel, flexible wound on said an exit opening the at one end of holder, and adjustable calibrated line-tensioning device in between reel line. The has evenly spaced short segments diameter long different diameter. When is snapped, chalk-covered leave marks which are visibly distinct from those left by
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