USPC 40
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| Enclosing categories | USPC |
|---|---|
| Subcategories | USPC 40/213, USPC 40/214, USPC 40/215 |
| Keywords | exhibitions, towing, streamers |
| Start year | |
| End year |
US Patent Classification class 40 is for "Card, picture, or sign exhibiting."[1]. This classification shows up for aeronautics because signs can be exhibited in the sky.
