Various Getter Electrode
WE300Aでは、ゲッターが載っていた電極の形が少なくとも3種類あります。(リング、
ひしゃく、短冊。)右端のは 300B です。
There are at least three types of getter electrodes (electrodes on which
the getter material was placed). A ring, a dipper and a flat sheet
metal with a bent part. The one on the right end is a 300B.