You can find some articles about Thorens in

1. MBSI Journal of Mechanical Music, Vol. 47, No. 1, Spring 2001:
   a) Thorens 4.5 Inch (11.5 cm) discs for 30 Teeth Combs, pages 14/20;
   b) The History of Thorens, pages 30/32.

2. MBSI Mechanical Music, Vol. 54, No. 1, January/February 2008:
   A Thorens' Christmas in the United States - 1941, pages 19/29.

Musical regards,
Hendrik Strengers
hekaton@hetnet.nl.geentroep [delete ".geentroep" to reply]