Oh yes. The old "mini-ringers" trick. We had trib offices that had Terminal Per Line shelves where the last digit was the ringer frequency, and later the fancy "frequency per shelf" where the 100's digit was the ring frequency and we had to deal with both harmonic and decimonic bells. In truth, normally only the 40/42,50/54 and 66 2/3's ringers had to be selective and the straight-line ringers would work on everything else.

I still have a box of them in my warehouse for my estate sale https://public.carl.airpost.net/misc/Mini_ringers.JPG