Full Details

Name and Model Number Denoyer-Geppert
Country of Origin USA
Date of Manufacture 1972
Front Scales  
Back Scales  
Scale Length  
Type of Rule Other
Construction Plastic
Area of Use Other
Comment Used for teaching.
Chalkboard projectable slide rule tutorial using 79, 35mm slides
in carousel, book and audio tape.
Rarity RRR
Donor Collection of Colin Barnes
Match Number 79

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.