| 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 |
| Thumbnail (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. |