The REVO Electric Company Ltd., Tipton, Staffs, UK are still in existence and make electric cookers among other things.
Their descriptor is given as 'REV' in my list. Their 36 Grenades are marked REVO.
Before WWII they made various electric lamps, particularly street lamps. These suddenly were no longer required.
They handled Mercury and Sodium metal etc so were well placed to pick up War Office tenders for heavy metal castings. I do not know if they actually filled 2" WP bombs.
There is no mention of 2" WP bombs in DWS Notes of 1942, so the tank men may have been happy with their generators smoke at that time ( there is a recent thread about the generators).
The need for a relatively easily reloadable discharger became necessary, so the Bomb Mortar 2" Bomb Thrower was produced, with the discharger mounted on the tank turret. WP also gives a good immediate burst and could be projected further if necessary. Because these were made to fit the 2" mortar these were linked to a future infantry requirement and produced in large numbers.
By 1945 they are in the next publications. In there it says that future production packages are to have "MOR" removed from the description because they were no longer required by the infantry. The infantry never had any use for them and were quite happy with the vast numbers of Bomb Mor 2" Smoke Mk 2.
The Pre '44' marking system was the green smoke body, with a white ring nearly half way down and WP in black letters, twice the size of the other black markings, above the ring.
The '44 - '48' marking system had the same white ring but without WP.
The '48 - to eventually '51', marking system had the white ring with a narrower white ring below it. Although this marking is shown in Inter (later 'Joint') Service Ammunition and Ammunition Package Markings Handbook 1948, it is unlikely that any were ever made with this marking, due to the large stocks made with the infantry in mind.
Fortunately (from a disposal point of view) a major war involving tanks began in Korea and great quantities were shipped to there.
Most of these tanks, if not all, still used the 2" bomb thrower.
With the cease fire in 1953 and the pull out in 1956 there were still plenty of these about, but as a former government 'authorised representative' for the transport of explosive stores, I can say that the last thing you wanted to bring back was the remnant of a dying system, particularly as they provide awful stowage safety problems, so they were disposed of locally.
By this time there were not many left in UK/European depots and these were disposed of and the Grenade No. 80, discharged by Fuze Electric F 103 became the tank smoke producer of choice.
They are not easy to empty and most if not all the ones held by collectors were probably training?instructional aids.
I forgot to say that a quantity of the 2" bomb thrower bombs were painted white for tank firing training purposes, but these were strictly controlled for obvious reasons and were quickly used up.
BMG50 you should have kept yours because they must be like rocking horse manure.