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US Patent: 1,428,582
Quick-Equalizing Marker Device for Drwaing Parallel Lines
Patentee: Frank W. Dietz (exact or similar names) - Cleveland, OH USPTO Classifications: 33/41, 33/664 Tool Categories: layout tools : compasses : dividers Assignees: None Manufacturer: Not known to have been produced Witnesses: Wm. M. Monroe Chas. F. Siph	Patent Dates: Applied: Mar. 24, 1919 Granted: Sep. 12, 1922 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: These drafting dividers automatically adjust to draw any number of parallel lines.

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