Courtesy of the Phillips Museum there are several silent films online about the manufacture of early vaccum tubes. Sadly Embedding was disabled so I'll just give you the links.
- PART 1: http://youtu.be/pnCYefwyd8U
- PART 2: http://youtu.be/GbsObrKT3ms
- PART 3: http://youtu.be/VLSZkUp2gTs
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