TY - BOOK AU - Townsend,George E. AU - Emrich,Oran S. AU - Ehrhardt,Roy TI - American pocket and wrist watch balance staff interchangeability list SN - 0913902527 PY - 1984///] CY - Kansas City, Mo. PB - Heart of American Press KW - Pocket watches KW - United States KW - Wrist watches KW - Clocks and watches KW - Repairing KW - fast KW - USA KW - Staff KW - Reference KW - Balancewheel KW - Practical ER -