US PATENT SUBCLASS 968 / 920
SYNCHRONIZATION [G04G 7/00]

Current as of: June, 1999
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968 /   HD   HOROLOGY

920SYNCHRONIZATION [G04G 7/00] {2}
921  DD  .~> Provided with arrangements to prevent synchronization by interfering signals [G04G 7/00B]
922  DD  .~> By radio [G04G 7/02] {2}