TY  - BOOK
AU  - Keelhoff,F.
TI  - Theory of terminal curves for the hairspring / F. Keelhoff ; translated by G. Droz and William O. Bennett
CY  - Lancaster, PA : Hamilton Watch Company, 1933.
KW  - Balance springs
KW  - Spirals
KW  - Clocks and watches
KW  - Design and construction
KW  - Watch (general)
KW  - Not Geographic
KW  - hairspring termina curve
KW  - unpublished manuscript
KW  -    watch balancewheel advanced theory
KW  - TheoryGeneral
KW  - Keelhoff, Fr
N1  - English translation of a portion of the original French work: Théorie des courbes terminales du spiral. Brussels : Académie Royal de Belgique, 1921
ER  -