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The ferrite core memory board is originally from computer R300 made by RFT VEB company in the GDR in year 1969.
A detailed view to several cores. The wires have 0.2 mm in diammeter and the cores have 2 mm in diammeter.
This and other detail photos has been made with Canon 3D camera and Sigma APO Macro 180mm lens. .
If you have any further information on this board, do not hesitate to contact me!