Mellotronists

Hi all
  new to this group.Found it through Andy Thompson's site.I owned 
M400#328 for 25 years...now using an Emu E4K with Pinder CD rom from 
Dave Kean.
  I have been trying to discover the earliest known appearance(s) on 
record of the Chamberlin,especially in any 50s music.Since they were 
sold and produced in California I am sure some studios must've had 
them back then.Andy thought he knew someone but he cannot recall the 
name yet.Anyone know any lps which used the Chamberlin in the pre-tron 
days?                               Charles Thaxton