Device for electroconductive connection and reading

A data storage retrieval memory device comprising:

• a. at least one exchangeable sheet of material which is electrical substantially non-conductive and provides a plurality of data storage positions on at least one side which can individually be coded by the presence and absence of marking material which is electrically substantially conductive at said data storage positions;
• b. a stationary pad on which said sheet is removably supported in overlying relationship providing a surface for carrying out said coding having first means with a plurality of electrical contacts for releaseably engaging said side of said sheet, said contacts including at least an individual one of said plurality of contacts directly contacting each of said storage positions to thereby contact any marking which may be placed thereon;
• c. contact means contacting all of said positions in common;
• and
• d. second means coupled to said plurality of contacts and said contact means providing an electrical readout device for sensing the presence and absence of said marking material at each of said data storage positions while said sheet, contacts, and contact means remain stationary with respect to each other, and said sheet is stationary on said stationary pad, said stationary relationship between said sheet, contacts, contact means and stationary pad being maintained during processing of data at all of said data storage positions on said sheet of material.