I am well qualified of Aladdin lamps... we had a caboose at the railroad I used to work at and it was equipped with Aladdin kerosene lamps. The mantles came in boxes and were pre-tied to a metal frame... I recall a warning about the mantles containing thorium or some radioactive element... We had a whole case of those mantles.... probably banned in the 1970’s.
A few weeks back I was visiting a friend in the Colorado Rockies that lives in an 1897 prospector’s cabin... off the grid. She had propane on site and the house was set up with Humphrey propane lamps... she was using coleman mantles, and I noted no radioactive element warning on the packaging.
I’m not sure if they changed the composition of the mantle and when.
I sold them for a long time. Never had a single complaint from a customer. Most probably still have them. Some were quite elaborate lamps. All were pleasant to read by.
At some point, I think they went direct marketing or cut down the number of suppliers. Have not searched for them in a while.
Several old companies did that. For example Mirro and Presto pressure cooker parts. Guess the web did that.