Excavating
Patent
1991-07-29
1995-01-10
Lee, Thomas C.
Excavating
395575, 371 91, 371 81, 3642703, 3642707, 3642705, 364DIG1, G06F 104
Patent
active
053815424
ABSTRACT:
Systems allowing smooth, trouble-free, "transparent" switchover from a "Primary clock" to a "Secondary clock", with no loss of clock or essential pulse-width, and where the "Secondary clock" may be completely separate from, and independent of, the "Primary clock."
REFERENCES:
patent: 4490581 (1984-12-01), Edwards et al.
patent: 4748417 (1988-05-01), Spengler
patent: 4853653 (1989-08-01), Maher
patent: 4882738 (1989-11-01), Suzuki
patent: 4970405 (1990-11-01), Hagiwara
patent: 5052030 (1991-09-01), Ernst et al.
patent: 5099141 (1992-03-01), Utsunomiya
patent: 5122677 (1992-06-01), Sato
Kim Sang Hui
Lee Thomas C.
McCormack John J.
Starr Mark T.
Unisys Corporation
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