1) G3171A, HP 5975 Innert MSD Standard-Turbo EI Mainframe for use w/6890GC

2) G 3172A, HP 5975 Inert MSD Perfromance Turb EI Mainframe for use with 6890 GC

3) G 3174A, HP 5975 Inert XL MSD EI/PCI/NCI Mainframe for use use/6890 GC, includes 262 L/sec turbo

pump, Inert EI ion source and CI ion source.

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