US PATENT SUBCLASS 968 / 923
.~.~ Provided with arrangements to prevent synchronization by interfering signals [G04G 7/02B]
Current as of:
June, 1999
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968 /
HD
HOROLOGY
920
DD
SYNCHRONIZATION [G04G 7/00]
{2}
922
DD
.~ By radio [G04G 7/02] {2}
923
.~.~ Provided with arrangements to prevent synchronization by interfering signals [G04G 7/02B]