US PATENT SUBCLASS 84 / 452 R
.~.~ Materials
Current as of: June, 1999
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| 84 / | HD | MUSIC |
|
| 1 | DF | INSTRUMENTS {9} |
| * | DD | .~ General features {7} |
| 452 R |  | .~.~ Materials {1} |
| 452 P | DF | .~.~.~> Plastic material |
Unofficial Alpha Subclasses: R P
DEFINITION
Classification: 84/452
Patents in which the novelty resides in a substitution of material.
(1) Note. See this class, subclasses 193 and 291.