Wm. Hardy's timekeeper : a pre-release from the American Horologist & Jeweler, 1952.
Hagans, Orville Roberts, 1897-
Wm. Hardy's timekeeper : a pre-release from the American Horologist & Jeweler, 1952. William Hardy's timekeeper : a pre-release from the American Horologist & Jeweler, 1952 - 19 pages : illustrations ; 23 cm
Hardy, William.
Clocks and watches--Escapements.
Clocks and watches--Design and construction.
Clock (general) UnitedKingdom Hardy escapement specific Hardy William EscapmentScience
Wm. Hardy's timekeeper : a pre-release from the American Horologist & Jeweler, 1952. William Hardy's timekeeper : a pre-release from the American Horologist & Jeweler, 1952 - 19 pages : illustrations ; 23 cm
Hardy, William.
Clocks and watches--Escapements.
Clocks and watches--Design and construction.
Clock (general) UnitedKingdom Hardy escapement specific Hardy William EscapmentScience