Index of /pdf/ibm/system3/5475
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   DIR /pdf/ibm/system3
       SY27-0073-1_Elastic_Diaphragm_Encoded_Keyboards_and_5475_Data_Entry_Keyboard_Theory-Maintenance_Manual_197103.pdf
       SY31-0247-0_Field_Engineering_5475_Keyboard_Theory_of_Operation.pdf