Bloody good invention. Some of the simplest ideas are the best.
Pity about the advertisement though.
"Capable of standing up to a pressure of 25 inch pounds & increasing or decreasing according to size of clip"
Firstly, inch pounds isn't pressure.
Secondly, even if the units were correct, the statement is a bit useless anyway. Basically says it's less than 25, more than 25, or perhaps 25 ???
I presume that claptrap came from some advertising dickhead who thought it sounded clever, but it makes the company look stupid. Should have been stomped on by the company's engineer.