with presignal; with repeated signal; with changeable intensity of sound

Full Title

Arrangements producing acoustic signals at preselected times > Alarm clocks > with presignal; with repeated signal; with changeable intensity of sound

Classification Context

Section:

PHYSICS

Class:

HOROLOGY

Subclass:

MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME-PIECES USING THE POSITION OF THE SUN, MOON, OR STARS