The "Customer" manual was a booklet included with each 600 unit sold. "602Intructions" was a leaflet supplied to purchasers of the 602 loudspeakers. All the above were 235mm wide by 191mm high. The "Service" manual was the set of instructions used at the factory, and by authorised repairers, to setup and test a set. This was a set of foolscap or A4 typed or copied sheets.