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B7G base: Difference between revisions
Created page with "The 7-pin '''B7G tube base''' was developed in the late 1930s for miniaturized all-glass tubes. The earliest tubes using this base were commercially introduced in 1939, such ..."
(Created page with "The 7-pin '''B7G tube base''' was developed in the late 1930s for miniaturized all-glass tubes. The earliest tubes using this base were commercially introduced in 1939, such ...") |
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