I found a bug. I cannot see any models of Shelvoke & Drewry:

http://www.imcdb.org/vehicles_make-Shelvoke+%26+Drewry.html

also same for Cottin & Desgouttes:

http://www.imcdb.org/vehicles_make-Cottin+%26+Desgouttes.html

Obviously it is the "&" which causes problems.