Details and Image
|Date||Scale Length||Area of Use
|Linear||UTO / 561||UTO||Denmark||Plastic||1960's||25 cm||Engineering
Notes: "The UTO Model 561 slide rule, made in Denmark, is almost a Rietz slide rule, but has an ST scale instead of a K scale. This is a true simplex slide rule, there is nothing on the back of the slide or back of the slide rule."