| Name and Model Number | Soviet KLPZ 250-14 |
| Country of Origin | USSR |
| Date of Manufacture | 1976 - 1978 |
| Front Scales | T1, K, A [B, CIF, CI, C] D, ST, S |
| Back Scales | LL3, LL2, LL1, L plus tables of constants and examples |
| Scale Length | 25 cm |
| Type of Rule | Slide Rule |
| Construction | Plastic |
| Area of Use | Generic |
| Comment | Made in Soviet KLPZ Factory for Calculating Instruments.
LOLD (Log-log duplex)slide rule (Modified Darmstadt). This rule modifies the typical Darmstadt configuration by eliminating the P-scale and adding a CIF-scale the front of the slide. The log-log scales move from slide to the back upper stator. |
| Rarity | RR |
| Donor | Collection of Marion Moon, California |
| Match Number | 303 |
| 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. |