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Tektronix TM502A Portable 2-Slot Plug-In Chassis / Mainframe Only. Condition is Used. Look at pictures at condition. Comes with the compartment that has a broken release. The compartment also has the cover that the turn knob broke. I can take that off if you want. I have used both slots and they both work. Ask me if you have any questions or want some more details.
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