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US Patent: 540,184
Markre for Slide Rules
Patentee: Thaddeus Norris (exact or similar names) - Washington, DC USPTO Classifications: 235/70B, 235/84, 359/442 Tool Categories: specialty tools : slide rules : cursors specialty tools : slide rules : circular slide rules Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Oct. 24, 1894 Granted: May 28, 1895 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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