Howdy
I have reprints of old Smith & Wesson catalogs. One is from 1905/1906, the others are from around the same time period. In all of these catalogs the name used is Hammerless Safety Revolver. The word Lemon Squeezer does not appear, it is a nick name.
Interestingly enough, Supica and Nahas have reversed the words to be 'Safety Hammerless (A.K.A. Safety, New Departure, or Lemon Squeezer)'
I collect old Smiths, and I have been known to use the term Lemon Squeezer, but it is just a nickname for any revolver that had a grip safety.