Hi Rod,
I have Overhead Projection Rules by FC and by Aristo in very good
conditions and with docs.
I have also Classroom Demonstration Ruler by FC, 2 m long.
Maciej
pt., 12 lut 2021 o 13:45 Rod Lovett <rod@lovett.com> napisał(a):

Hi All,
Does anyone have any details, good images, references etc., of
Classroom Demonstration Rules and/or Overhead Projection Rules
and/or Slide Projection Rules made by Dietzgen?
Regards,
Rod

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Wiki: https://pl.wikipedia.org/wiki/Maciej_Marek_Sysło [1]
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[3] https://groups.io/mt/80581866/2049020
[4] https://groups.io/g/sliderule/post
[5] https://groups.io/g/sliderule/editsub/2049020
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