|Name and Model Number||Denoyer-Geppert|
|Country of Origin||USA|
|Date of Manufacture||1972|
|Type of Rule||Other|
|Area of Use||Other|
|Comment||Used for teaching.
Chalkboard projectable slide rule tutorial using 79, 35mm slides
in carousel, book and audio tape.
|Donor||Collection of Colin Barnes|
|RR||= Rare -- 1 of 25 collectors has one; it may take a year to find an example in the marketplace.|
|RRR||= Very rare -- only very few known to collectors; may take several years before one comes up for sale.|
|RRRR||= Extremely rare -- a museum piece; unlikely that an example will ever come up for sale.|