3304504
Gate generator synchronizer, Feb.,
1967 Horlander 364/484.
3555256
Automatic electronic counter apparatus,
GR,
Jan., 1971 Westlake
364/701.
3609326
Counting apparatus and method using separate counters for
reference and unknown signal,
HP
Sep., 1971 Bagley et
al. 364/551.
3631343
Time interval averaging circuit,
HP
Dec., 1971 Schmidhauser
324/186.
4073432
Circuit arrangement for determining the average value of a
frequency Feb., 1978
Schroder 324/78.
page created 21 Dec 2006.