CHALK BOX WITH LINE LOCK ASSEMBLY
作者： Wilson Cecil , Van Fossen Eric
DOI:
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摘要: A line lock assembly for locking a retraction of chalk box may include cover (250) operably coupled to housing the form member enclosure, and (260) disposed within enclosure. The be configured move responsive rotation alternately unlock based on position cover.
lens.org 参考文章(2)
Anne Nemes, Automatically retracting chalk line marking tool ,(1996)
Hamilton Sean Michael Whitney, Chalk line device ,(2005)