A G. Bernhardt's Combined Slide Rule And Propelling Pencil, German, early 20th century, (4)
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A G. Bernhardt's Combined Slide Rule And Propelling Pencil, German, early 20th century, in silvered metal, together with a Nicolet slide rule pencil, a Dring & Fage brass rule and 6-inch brass sector, the largest 18in (46cm) long (4) Footnotes: Exhibited: Scientific Instrument Society 25th anniversary exhibition, Museum of the History of Science, Oxford, 2008. (Dring & Fage slide rule) For further information on this lot please visit Bonhams.com For further information about this lot please visit the lot listing
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A G. Bernhardt's Combined Slide Rule And Propelling Pencil, German, early 20th century, (4)
Estimate £300 - £400
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