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Propeller for Boats.
Patent for improvements in propellers for boats by “having a pair of hinged propeller-blades adapted to swing toward and away from each other, combined with fixed prongs; which are engaged with the propeller blades and hold them from displacement.” (Lines 60-65) Illustration is included.
Date:
May 5, 1891
Creator:
Gillespie, Lewis
System:
The Portal to Texas History