Electronic apparatus for direct computer assisted photo-grammetric plotting; computers adapted for plotting purposes; parts and fittings included in Cl. 9 for all the aforesaid goods; electronic apparatus for the plotting of data; electronic apparatus for the acquisition, input display, output and storage of data, all being for plotting purposes; magnetic discs, magnetic tapes, magnetic films punched (encoded) tapes and punched (encoded) cards, all being for use with the aforesaid goods.