I used to deal with it when I worked at Pfizer. A single 100L Dewar of Liquid Helium would cool their 4 gauss magnets better than 4, 300L dewars of Liquid Nitrogen.
You had to remove your wallet and the dewars were made of aluminum (entirely). Even when off the magnets were strong enough to wipe your Credit Card swiper.
I filled Liquid Nitrogen dewars , changed any gas cylinder you can think of. If they didn't shut the facility down, the Linde Gas sales rep., would have given me much things to tinker around with.