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US4632394A Athletic swing plane trainer 失效
秋千飞机教练

Athletic swing plane trainer
摘要:
A backstop supports a ball which is encircled by non-fabric straps whose ends overlap and are secured by pile and loop fasteners. A vertical elastic tether is fastened at one end to one of the straps and at its other end to a metal hook which detachably engages a horizontal overhead chain-link mesh portion of the backstop. The backstop also has vertical chain-link mesh portions which support targets. A transverse inelastic cord is secured at one end to a ball strap and at its other end to one of the vertical mesh portions near a target. A pole with a fork on its end is used to engage and disengage the metal hook relative to the overhead chain-link portion.
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