Did you know that each cardboard toilet roll tube has a long number inside? The one in this photo, as far as I can make out, is : H 212: 17 252 00:47
I have read that there are companies now that are making TP without the cardboard tube.
Also an excerpt from the same article states that Scott Paper Co. was the first to insert a cardboard tube into the roll in 1890.
After 128 years, going tubeless!