F.371 Data Sheet MJS-p-0427

back to Collection Data Sheets

Relay, 505, c.1960

Serial Number or Date Stamp:

Country: JPN

Primary construction material: bb

Case included?: yes

General Description: Basic linear polyphase slide rule

Length of 1 decade = 5 in, and overall scale length = 5 in. The largest physical dimension is 5 in.

Front Scales: cm /| A [ B CI C ] D K || in

Back Scales: [ S L T ]

Notes: pocket bamboo rule; Owner H. Feist, Seattle

References: https://sliderulemuseum.com/Ricoh.shtml#Relay

Date Acquired: 05/23/2026