Full Details

Name and Model Number Shanghai KXSJ
Country of Origin China
Date of Manufacture c 1979
Front Scales Special = Special = Special DF = CF CIF CI C = D
Back Scales Special = Special CI C = D A K L = S T Special = Special
Scale Length 25 cm
Type of Rule Slide Rule
Construction Plastic
Area of Use Other
Comment Used for profile steel hole design.^M
Two slides and two cursors
Rarity RRR
Donor Collection of Tang Cheng
Match Number 94

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.