A MADAS CALCULATING MACHINE

A MADAS CALCULATING MACHINE, 1913 onwards, No.5373, inscribed 'USA Ptd. Dec. 16th 1913 etc', with the original booklet titled 'Directions for the Proper Use of the Madas Calculating Machine' published by the manufacturers H.W.Egli S.A., Zurich, 23 3/4" wide