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The Australian Pattern Signals Van      
Known as the Sigvan or Pievan, this is a design unique to GM-H in Australia. It was a steel body insulated with caneite, a soft board made from pressed sugarcane pulp after the sugar had been extracted, and covered with plywood with a top layer of light plywood.. This is probably the most commonly found full-bodied CMP today. They were built on both the C15 and C15A chassis. GM-H designated them WO12 models.      
Army portraits of a C15A version of the wireless truck taken at Wesley in Melbourne. The cab was partitioned from the bodył Steel sliding panels were provided for windows in the front and rear door.    
A Canadian F15A based wireless van was imported and it is likely the Australian version was developed from this. The main difference was the Holden version incorporated an integral body with a similar (but not the same) profile to the #9 artillery tractor Note the Australian ARN 123199. This body survived at Hughes Trading in poor condition until 2000.    
The step in the roof was higher than that of the CGT #9. The contraption at the right is a counterbalanced LMG mount for antiaircraft protection, usually used with a bren gun.      
Some factory images of completed bodies awaiting mating to chassis.      
See also Sigvan survivors