with contacts operated, or formed, by clock hands or elements of similar form

Clocks with attached or built-in means operating any device at preselected times or after preselected time-intervals > Mechanisms continuously running to relate the operation(s) to the time of day > for operating a number of devices at different times > with contacts operated, or formed, by clock hands or elements of similar form

Clocks with attached or built-in means operating any device at preselected times or after preselected time-intervals (if restricted to producing acoustic time signals by electrical means G04C21/00) > Mechanisms continuously running to relate the operation(s) to the time of day > for operating a number of devices at different times > with contacts operated, or formed, by clock hands or elements of similar form