Full Details

Name and Model Number	Russian Pilot's Slide Rule NL-10m
Country of Origin	Russia
Date of Manufacture	Est. 1960-1970
Front Scales	Pressure, temperature, and altitude and others
Back Scales	Same
Scale Length	25 cm
Type of Rule	Slide Rule
Construction	Paint on a light white wood – aluminum end brackets – plastic cursor
Area of Use	Aviation
Comment	Difficult to read due to Russian characters
Rarity	RR
Donor	Collection of Clay Castleberry
Match Number	339
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In conjunction with our 'donors' we assign a rarity rating to each item, based on the system devised by Herman van Herwijnen

(1929 - 2004), renowned Dutch collector, author, and creator of Herman's Archive, a collection of 5,000 slide rule images on CD.

• RR = Rare - 1 of 25 collectors has one; it may take a year to find an example in the marketplace.

• RRR = Very Rare - only a few known to collectors; may be several years before it comes up for sale.

• RRRR = Extremely Rare - a museum piece; unlikely that an example will come up for sale.