....
Congrats on getting to this guy before anyone else did. This type of
device
has been used on construction sites since the invention of the circular
saw.
Worked great when framing my windows a couple months ago.

I used to work for a hardware company.
A guy sent us his new patent for a hasp with a hook built in.
Odd think is that we were already selling it; in fact it was in our 1898
catalog.
A year later I went to Mexico and found it on the door of a house built in
1575.
Yet the US Patent Office gave him a patent.
Go figure.