✦ LIBER ✦

Vacuum diffusion pump: Edwards High Vacuum Ltd,Brit patent, 1,066,971, Patent abstr, 7 (20)part B, 19th May 1967, 4

No coin nor oath required. For personal study only.

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Diffusion pump: Balzers Pat Lizenz-Anst,

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1831. Cold trap: Edwards High Vacuum Ltd

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