THE EVOLUTION OF THE QUARTZ CRYSTAL CLOCK

[61] Heaton V. E., 1947, INSTRUMENTS, V20, P618

[62] HEISING RA, 1946, QUARTZ CRYSTALS ELEC

[63] HELLWEG JF, 1937, FRANKLIN I J, V223, P549

[64] HELLWEG JF, 1932, T A I E E, V51, P538

[65] HOPEJONES F, 1931, ELECTRIC CLOCKS

[66] HOPEJONES F, 1937, FRANKLIN I J JAN, P95

[67] HOPEJONES F, 1943, HOROLOGICAL J NOV

[68] HOPEJONES F, 1943, HOROLOGICAL J OCT

[69] HOPEJONES F, 1940, ELECTRICAL TIMEKEEPI

[70] Horton J. W., 1928, U.S. patent, Patent No. [1,690,299, 1690299]

[61] Heaton V. E., 1947, INSTRUMENTS, V20, P618

[62] HEISING RA, 1946, QUARTZ CRYSTALS ELEC

[63] HELLWEG JF, 1937, FRANKLIN I J, V223, P549

[64] HELLWEG JF, 1932, T A I E E, V51, P538

[65] HOPEJONES F, 1931, ELECTRIC CLOCKS

[66] HOPEJONES F, 1937, FRANKLIN I J JAN, P95

[67] HOPEJONES F, 1943, HOROLOGICAL J NOV

[68] HOPEJONES F, 1943, HOROLOGICAL J OCT

[69] HOPEJONES F, 1940, ELECTRICAL TIMEKEEPI

[70] Horton J. W., 1928, U.S. patent, Patent No. [1,690,299, 1690299]