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I could be wrong, but I'm pretty sure that Browning used Delayed Blowback (a feature of M1911, and a few of his other pieces prior to that) a bit earlier than H&K did. Was H&K even in existance in 1911? As to long-arms, the Thompson was the first long arm I am aware of to use Delayed Blowback, specifically purchsing the rights to the Blish Lock patent.
Not dogging H&K, they make awesome stuff. I've put many rounds through the USP that I bought for my mother. Just not sure why you would include Delayed Blowback as an H&K innovation. Admittedly, they did great things with it, especially on the G3, but how is it one of their innovations?
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