Title
Log-Log Duplex Trig Slide RuleCatalog Number
XD50.76Type
Physical objectDate
1939Manufacturer
Keuffel & Esser CompanyPlace Manufactured
U.S.Identifying Numbers
| Model number | 4080-5 |
| Other number | RE.20.984 patent number |
| Serial number | 445652 |
Dimensions
1/2 x 23 3/4 x 2 1/8 in.Category
Pre-computer/slide ruleSubject
Analog; Hand calculation; Oughtred, WilliamCredit
Gift of Dick ClaytonLot Number
XD50.76
Related Records
| 102798277 | Log-Log Duplex Trig slide rule |
| XD50.76B | Log-Log Duplex Trig slide rule case |