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US Patent: 2,589,500
Combined Chalk Line Box and Plumb Bob
Strait-Line
Patentees:
Robert K. Landon - Costa Mesa, CA
John R. Thomson - Corona del Mar, CA

USPTO Classifications:
242/395.1, 242/396.1, 242/405, 33/393, 33/414

Tool Categories:
layout tools : plumb bobs

Assignees:
Strait-Line Products - Costa Mesa, CA

Manufacturer:
Irwin Auger Bit Co. - Wilmington, OH

Witnesses:
Unknown

Patent Dates:
Applied: Sep. 19, 1949
Granted: Mar. 18, 1952

Patent Pictures:
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Description:
Chalk line box is shaped (pyriform) as and serves as a plumb bob when needed.

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