“N^o  625”

Data:

• Mannheim with unmarked scales.
• The back of the slide has an S and T scale, which are indicated by letters.
• Under the slide is an extension of the cm ruler.
• Scales screwed on wood.

Question:

1. Who is the manufacturer?
   The manufacturer is Alfred Martz from Stuttgart.
   Due to the questions from a fellow collectioner, I made some research work covering his two unknown Mannheim slide rules, marked “AM”. The attached document (in German) presents the results of my research. See also Georg Schreiber, “Koch, Huxhold & Hannemann” Jacques Perregaux
   Alfred Martz is only a distributor, not a manufacturer. The shown slide rule was produced by KHH Hamburg, not Nestler. Andreas Faßbender