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I am looking for prior art for US patent 7438306 I belive this patent may have overly broad claims There is an AME kit that may have a german patent that is prior art

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My tools that I use are restricted to the USPTO at this time, all results found are from there.

https://www.google.com/patents/US7111861

The above invention uses a pneumatic piston (as opposed to a semi-perpendicular rod setup) to achieve the same effect.

https://www.google.com/patents/US5967538

The above invention uses a pivot ball (as opposed to a semi-perpendicular rod setup) to achieve the same effect.

https://www.google.com/patents/US8720928

The above invention uses interchangeable pucks to achieve the same effect.

https://www.google.com/patents/US5209319

The above invention uses a bar system to provide a stiff brace, but is not related.

https://www.google.com/patents/US7360963

The above invention can fixedly change the rake angle, but is not related.

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