Mellotronists

Hi there,
the Pinder CD booklet lists Mellotron and Chamberlin sounds. Among 
violin sounds there are MarkII Violins, Tron Violin Section, Tron 16 
Violins, M300 Violins and Chamberlin 3 Violins. Now, what type of 
violins have been used as 3 Violins in the famous M400 Mellotron (the 
white one)? 
Any Information would be helpful. Thanx