US PATENT SUBCLASS 396 / 397
.~.~ From film itself

Current as of: June, 1999
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396 /   HD   PHOTOGRAPHY

387  DF  WITH FILM DRIVE {7}
395  DF  .~ Film movement limiting means {2}
397.~.~ From film itself {3}
398  DF  .~.~.~> Having switch actuated by perforation sensing pawl
399  DF  .~.~.~> Having film locked by perforation sensing pawl
400  DF  .~.~.~> Having film transport mechanism locked by perforation sensing pawl

DEFINITION

Classification: 396/397

From film itself:

(under subclass 395) Subject matter including means to detect film movement and in response to the detection limiting advancement to the desired increment.