| Name and Model Number | Hemmi No. 200 40 cm Scales Folded 6x |
| Country of Origin | Japan |
| Date of Manufacture | 1937 - 1967 |
| Front Scales | D6 D5 D4 [C6 C5 C4 C3 C2 C1] D3 D2 D1 |
| Back Scales | DF6 DF5 DF4 [CF6 CF5 CF4 CF3 CF2 CF1] DF3 |
| Scale Length | 40 cm folded 6 times = 2.4 meters |
| Type of Rule | Slide Rule |
| Construction | Celluloid on bamboo with metal framed glass cursor |
| Area of Use | Generic |
| Comment | For precision math.
Overall size 4.5 cm x 50 cm. This is one of two precision long scale duplex slide rules made by Sun Hemmi. The other model (No.201) folds its 50 cm scales 4 times for a scale length of 200 cm = 2 meters. |
| Rarity | RR |
| Donor | Collection of Ed Chamberlain, USA |
| Match Number | 125 |
| 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. |