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Tek ot503.jpg | Tek ot503.jpg | ||
Tek ot503 rear.jpg | Tek ot503 rear.jpg | ||
Tek ot50x and or50x 1986 catalog.jpg|1986 Tektronix Catalog Page Describing OT503 | |||
Tek ot50x and or50x 1987 catalog.jpg|1987 Tektronix Catalog Page Describing OT503 | |||
</gallery> | </gallery> | ||