Full Details

Name and Model Number Hemmi P135k
ISRG Commemorative - 2005
Country of Origin Japan
Date of Manufacture 2005 (Date code is 21ED: 21st century, 5th year, 4th month)
Front Scales T, K, A* [B*, CI*, C*] D*, P, S (* = scale extensions)
Back Scales [L, LL*, LL2*, LL3*]
Scale Length 20 cm
Type of Rule Slide Rule
Construction Plastic
Area of Use Generic
Comment This rule was made as a commemorative 21st century slide rule for members of the International Slide Rule Group.
It has a unique construction in that the log-log scales on the back of the slide can only be used by removing the slide
and re-inserting it as shown in the photos. The ‘back’ index hairlines are seen across the gap between the stators.
Rarity RR-RRR
Donor Collection of Marion Moon, California
Match Number 301
(Click Picture for Details)

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.