[Binary slide rule].
- Chicago : Frederick Post Co., [approximately 1940].
- Physical description
- 1 slide ruler inside leather case ; 21 cm in diameter; leather case 23 cm
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|CF. TA590 A9 .F7 1940||In-library use|
- Corporate Author
- Frederick Post Co.
- Publication date
- Includes booklet: Instructions for using the binary slide rule.
- "Copyrighted 1931".