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Tek or502 ot502 1.jpg|OT502 and OR502 | Tek or502 ot502 1.jpg|OT502 and OR502 | ||
Tek or502 ot502 2.jpg|OT502 and OR502 | Tek or502 ot502 2.jpg|OT502 and OR502 | ||
Tek ot50x and or50x 1986 catalog.jpg|1986 Tektronix Catalog Page Describing OT501 | |||
Tek ot50x and or50x 1987 catalog.jpg|1987 Tektronix Catalog Page Describing OT501 | |||
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