Re: Valve Items - Philips/Mullard Rimlock-to-Noval Transition
The special sealing method might be fritting the button to the tubing as was usual in rimlock valves. This was abandoned after the first generation noval valves.
Looking at the 1951 ad, this indeed seems to be the case. I've got a few of those in my collection, EABC80 a.o.
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