Claimant(s): Hughes, H. and Son; Hyde-Thomson, R.D. Nature of Invention: Aeroplane compasses
Description: Claimant(s): Hughes, H. and Son; Hyde-Thomson, R.D. Nature of Invention: Aeroplane compasses.
Date: 01/01/1921 - 31/12/1923
Last import: September 11, 2017