US PATENT SUBCLASS 109 / 21.5
.~.~ Protected voice transmitting path

Current as of: June, 1999
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109 /   HD   SAFES, BANK PROTECTION, OR A RELATED DEVICE

2  DF  BANK PROTECTION DEVICES {3}
10  DF  .~ Safety transaction and display partitions and counters {5}
21.5.~.~ Protected voice transmitting path

DEFINITION

Classification: 109/21.5

(under subclass 10) Devices in which the partition has an indirect passage permitting passage of sound waves but preventing passage of solid objects (such as projectiles).

SEE OR SEARCH CLASS

181, Acoustics,

18, 22, for speaking tubes and subclasses 148 and 157, for diaphragms and mounting.