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I cannot understand how this patent was awarded. It seems very similar to a previous US patent, 5,600,892 and the products advertised as protected by the 8272136 patent is very similar to the product built on the original patent. How could the USPTO not have found the '892 patent when examining the application that resulted in the '136 patent?

These are the cover figures of each.

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Welcome to Ask Patents! We tend to post questions with more content so that a reader can get some understanding without needing to follow links. –  George White Mar 8 at 8:49
I have toned down the rhetoric a little and added images from the two (*very+ similar) patents. –  George White Mar 9 at 0:57

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