U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

A self contained protective enclosure with an opening for entry and egress and a screen for ventilation and viewing.

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Class 152/22 - Combined spring and friction

Subclass of Class 152 - Resilient tires and wheels
Definition: The lateral thrust or tension mechanism supporting the spring
No. of patents: 0