F.4 Data Sheet 4
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Acu-Rule, Connecticut Spring, 1955
Serial Number or Date Stamp:
|Country: USA||Primary construction material: pl||Case included?: yes|
Length of 1 decade = 10 in, and overall scale length = 10 in. The largest physical dimension is 10 in.
Front Scales: d [ D N ] P/f
Back Scales: D [ d P ] S
Notes: Spring design calculations rule,version 3, made for Connecticut Spring Corp.
References: JOS v15.1p28
Date Acquired: 10/12/2022