Manufacturer: Aristo
Country of Manufacture: Germany
Type: Federfix 920
Date of Manufacture:  
Scales: (Front) Many specialised scales and curves
Scales: (Back)  
Number of Scales: 13 + multiple curves
Gauge Points:  
Slide Rule made from: Plastic
Cursor made from: Plastic
Cursor Lines: 30 curves
Overall Length of Rule: 37.0 cm
Length of Scales: max 34.6 cm
Width: 20.3 cm
Depth: 2.0 cm
Acquired from: Petra Junke
Date: March 2004
Condition: Good
 Padded presentation case.  Good condition
 Instruction (German). Good condition
 Used in the computations for cylindrical coil springs.