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#28
07-01-21, 14:19
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My understanding is that the Gas Welding trailer (that would have had the gas cylinders) was built in a 15 cwt trailer, so this may not be a very likely answer.
The following is pure speculation - perhaps kit transferred from a 15 cwt to 20 cwt depending on what was available - or possibly later production on 20 cwt (but I haven't seen any documentation to suggest this)? 
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