Invention Grant
US07971685B2 Pump jack tree stand 失效
泵千斤顶树架

Pump jack tree stand
Abstract:
The invention comprises, in one form thereof, a pump jack tree stand including a platform and a seat engaging a pump jack. The pump jack cooperates with a pole that is supported by an adjacent tree. The user actuates a foot lever on the pump jack to climb the pole. The pump jack's release is hand actuated as opposed to the commonly used foot-actuated release.
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