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"content": "nostr:npub1ks70cf3wt30sn2gqjnw4zjtd7ztwnnaq4fy0azpdvtlthg7eqrpqlteg5u nostr:npub1kvnpp3m60derhwpqwc09zhk3ehk48tr6agc6dk9z2vggu9sga28qpxhm73 May I also draw your attention to the connection between the metal base and the glass envelope of the valves that De Forrest and others after him developed. The seal - which was tricky because of the different expansion behaviour of the metal and the glass - was invented by William Houskeeper. It had to be absolutely vacuum tight and easy to manufacture. The seals were a key foundation of the electronics and computer industry. https://www.chemistryworld.com/opinion/houskeepers-seal/3007150.article #ClassicKit",
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