I’ve been wondering this for quite a while now. I think Simplex made the original T Bar Pull Station but is the design Owned by Simplex but other Companies use it? Or is it just a coincidence that Pulls like the RSG look like a 4251-20.
Simplex is definitely not the original, but the reason so many companies used it (now it’s really only about three) is probably because it’s simple to use and looks like a fire alarm (granted all pulls do, but the T-bar likely has the most “fire alarm” look to the general public)
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