A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Ed Popko
Date: 2018 Jun 17, 04:09 -0700
Do any NavListers have any of these bubble sextants that also have patent numbers on them?
I'm interested in adding dates to the Navigation Chronology and have been unsuccessful in using the U.S. Trademark and Patent Office search to find anything.
Often, if you have one patent number, that patent will also list related ones to demonstrate the award is not an infringement.
Sextant, A-10A, Fairchild
Sextant, Aircraft Periscopic, D-1, Kollsman Instrument Corporation
Sextant, Brandis, with Willson Bubble Telescope, Early
Sextant, Bubble, Averaging, AN 5851-1
Sextant, Bubble, Prototype, National Bureau of Standards for USN, Model 2, S/N#2