By Closing A Contact To Ring An Electromechanical Alarm [g04c 21/20] Patents (Class 968/591)

By the hand(s) or handlike members closing the contact [g04c 21/20b] (Class 968/592)

Put into action by the arbor of a mechanical alarm work [g04c 21/22] (Class 968/593)

Put into action by the spring of a mechanical alarm work [g04c 21/24] (Class 968/594)

Put into action by the vibrations caused by the operation of a mechanical alarm work [g04c 21/26] (Class 968/595)

There are no patents to show for this class.