Dangos 1 canlyniad

Disgrifiad archifol
Hughes, William, Bethesda (Caernarvonshire)
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Disgynnol

Window spring patent

Specification for improvements in apparatus for balancing and operating windows patented by William Hughes, Bethesda, 1892; agreement for partnership with W. J. Parry; and correspondence relating to the invention, 1892-1893.