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Re: Plath bubble sextant on ebay (C&P versus Plath)
From: Wolfgang Köberer
Date: 2015 Mar 23, 13:26 -0700

A short addendum: in the Plath "Festschrift" of 1962 this 1919 patent by Barton Booth is mentioned as describing the same principle as the SOLD-sextant.

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