1. Relay Log Log engineering rule.

Brand	Relay
Model	153
Country of Manufacture	Japan
Scales Front	L, LL1, DF [CF, CIF, CI, C] D, LL3, LL2
Scales Back	K, A [B, S, ST, T, C] D, DI
Number of Scales	19
Slide Rule Materials	Bamboo/Celluloid
Cursor Materials	Nylon/Plastic with metal screws
Cursor Lines	1 Front, 1 Back
Scale Length	25 cm
Length	32 cm
Width	4 cm
Condition	Good
Documentation
Accessories	Leather case Original box