1. Rule made by Relay/Ricoh.
2. Appears identical to Lutz 252 which was probably made for Lutz by Ricoh.

Brand	Relay
Model	252
Country of Manufacture	Japan
Scales Front	DF [CF, CIF, CI, C] D, L
Scales Back	K, A [B, T1, T2, ST, S] D, DI
Number of Scales	16
Slide Rule Materials	Bamboo/Celluloid
Cursor Materials	Nylon/Plastic with metal screws
Cursor Lines	1 Front, 1 Rear
Scale Length	25 cm
Length	31.5 cm
Width	4 cm
Condition	Good - slight discolouring on the edge scales beginning to occur.
Documentation	None
Accessories	Leather case