Mine looks to have the same source, I cleaned it up many years ago bu the same page tear is there. Easy to work out the missing wording though.
Clive, the front page I have on the '62 document has been defaced, probably to remove the "Restricted" markings and the WO reference. At the bottom of the page is quoted 1962 and J2-JB 10912.
The VAOS I have with the equipment list is Section J2 57/Vocabulary/382 dated June '39, this is the earliest version I have found in my research on the Hydra. It also lists items that were quite rapidly phased out so its a bit of a red-herring in terms of what was subsequently used in practice but its useful for the early stuff.
The '45 57/General(A)/4196 is also a really useful one made by the DCS as it shows the later improvements and what was in-use at the end of the war. A number of these were improved again and the '62 document is really representative of what was in-use until they were phased out in the 80s.
Alec.