letter scale

Although the mark of Ph.J. Maul can't be found on this letter scale, it's with great certainty a letter scale of Ph.J. Maul. The model can be found on a poster of Ph.J. Maul under position number Pos. 22, with Art. No. 360 / 350. The number 360 is at the back of the frame, probably this is the model number. Also at the back the text: Ges. Geschützt is given. This means: protected by law. The 350 is the range of this scale. At the turnable foot the number 52 is set, I don't know the meaning. In the literature ±1905 is given as the date of manufacture (Rübenthal). The M-mark of Maul starts only in 1909, so it's logical it's not on this scale. At the chart, the D.R.G.M. numbers 168741 en 179460 are given. D.R.G.M. is the abbreviation of Deutsches Reich Gebrauchs Muster. This is a model registration, quicker and cheaper than a patent registration. I don't know why there are two numbers. I still don't possess copies of the registration papers.