Blundell Rules Ltd.
||Donor's ID number for rule
overall: 1/4 in x 6 1/4 in x 1 1/4 in
The object consists of a slide rule and leather case. Printed on the back of the slide rule is "AUTOMATIC TELEPHONE & ELECTRIC CO LTD." Printed on the case is "ATM".
Pre-computer: slide rule
Gift of Mike Konshak