|Name and Model Number||Comptator Adding Machine|
|Country of Origin||Germany|
|Date of Manufacture||c. 1920|
|Area of Use||Generic|
|Comment||Stylus is inserted in toothed slides and moved downward for addition.
Size 60 x 205 x 32 mm. Weight 750 g. Has automatic carry mechanism.
|Donor||Collection of Gary Flom|
(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.|