US PATENT SUBCLASS 472 / 66
.~ Pyrotechnic display

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472 /   HD   AMUSEMENT DEVICES

57  DF  ILLUSION OR STAGE DEVICE {17}
66.~ Pyrotechnic display

DEFINITION

Classification: 472/66

Pyrotechnic display:

(under subclass 57) Amusement device in which the illusion is effected by a firework or other similar device designed to burn, explode, or otherwise produce a flame so as to produce a spectacular visual effect to an observer.