Service Van Stock List 1961

[AndrewM]

It's little gems like these scans that make this such an interesting hobby.

The service companies internal part number code appears to be quite straightforward to decipher. The first letter (T) is most likely the first letter of the companies name and the second letter is the part type (R - Resistor, C - Condensor etc).
I'd have to go and check in some old trade magazines to see what companies in Melbourne beginning with T were around in 1961. I'm not sure when Telefix started operations but the van stock list indicates a large organisation as I doubt any small business could afford that amount of spares stock in their van.