Backing pump for metal diffusion pump

• To: neon-l@netcom.com
• Subject: Backing pump for metal diffusion pump
• From: crawford@ilhawaii.net (Ted Pirsig)
• Date: Sun, 28 Jan 1996 20:31:53 -1000
• Reply-To: neon-l@netcom.com
• Sender: owner-neon-l@netcom.com

> metal diff pumps must run on a seperate
>backing pump than the rough pump.

Huh? Why "must"? I don't run mine this way, seems to work fine.

-Ted

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