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US Patent: 2,589,500
Combined Chalk Line Box and Plumb Bob Strait-Line
Patentees: Robert K. Landon (exact or similar names) - Costa Mesa, CA John R. Thomson (exact or similar names) - 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: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
Description: Chalk line box is shaped (pyriform) as and serves as a plumb bob when needed.

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