By talking to the French patent office, circa 1950s, apparently. I don't know what you're on about with the rest, but I'm just parroting what's well-documented, you're welcome to go look it up.
I figured you had to trademark specific numbers, not a regular expression "[0-9]+ 0 [0-9]+", which is how I'd guess it would work in the US, vs enumerating all the numbers in separate trademarks (patent #1 (100), patent #2 (101), ... (909)).
92818181818 0 1. Probably didn't get that, eh!