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1 -- Medium Metal Cap
2 -- Short Ribbon Anode Connector
3 -- Filament Support Springs
4 -- Mount Support
5 -- Top Ceramic Mount Support
6 -- Top Shield
7 -- Aligned-turn Control and Screen Grids
8 -- Heavy Duty Filament
9 -- Large Sturdy Graphite Anode
10 -- Hard Glass Envelope
11 -- Bottom Shield Disc
12 -- Ceramic Anode Support Spacer
13 -- Directive-type Getter Container
14 -- Dish Type Stem
15 -- Ceramic-Insert Giant Base
16 -- Beam Confining Plate
17 -- Filament Connector
18 -- Tungsten-to-Glass Seal
19 -- Bottom Ceramic Mount Support
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