US PATENT SUBCLASS 368 / 93
.~ Gravity actuated type (e.g., hourglass)

Current as of: June, 1999
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368 /   HD   HOROLOGY: TIME MEASURING SYSTEMS OR DEVICES

89  DF  TIME INTERVAL {6}
93.~ Gravity actuated type (e.g., hourglass) {2}
94  DF  .~.~> With alarm means
95  DF  .~.~> With special support means

DEFINITION

Classification: 368/93

Gravity actuated type (e.g., hourglass):

(under subclass 89) Subject matter wherein the time indicating part of the timepiece is controlled by the flow of a fluid or granular material due to gravity or by the movement of a solid body due to gravity.