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Without digging into the specific patent(s), usually it's because either the patent(s) has expired, or, if the patent(s) is still valid, there is sufficient difference in materials and/or design that it is not considered an infringement. Do you happen to know what elements of the Harris bipod are covered by patent(s)?
What "copy" brands are you referencing to exactly?
Cheers,
C
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Shoulder Drive Nicholson Club
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