G
SECTION G — PHYSICS
  
INSTRUMENTS
 G04
HOROLOGY
 G04B
MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME-PIECES USING THE POSITION OF THE SUN, MOON, OR STARS (spring- or weight-driven mechanisms in general F03G; electric parts of clocks or watches G04C; clocks or clock mechanisms with attached or built-in means operating of any device at a preselected time or after predetermined time intervals G04C 23/00; clocks or watches with stop devices G04F 7/08)
 G04B

Note(s)

This sub-class includes mechanically-driven calendar clocks or clockwork calendars, and the mechanical part of such clocks or calendars.


 G04C
ELECTRIC CLOCKS OR WATCHES (mechanical parts of clocks or watches in general G04B)
 G04C

Note(s)

This sub-class includes electric features of mechanically-driven clocks or watches, such as electric winding of such clocks or the provision of electric contacts thereon.


 G04D
APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES (machine tools in general B23, B24; hand tools in general B25)

 G04F
TIME-INTERVAL MEASURING (measuring pulse characteristics G01R, e.g. G01R 29/02; in radar or like systems G01S; masers H01S 1/00; generation of oscillations H03B; generation or counting of pulses, frequency dividing, analogue/digital conversion H03K)  [2]
 G04F

Note(s)

This sub-class includes:

  1. apparatus for measuring-off predetermined time intervals;
  2. apparatus for producing such intervals as timing standards, e.g. metronomes;
  3. apparatus for measuring unknown intervals, e.g. precision systems for short-time-interval measurement. [2]