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Digital Computers; Main Frames; Magnetic Recording Heads and Head/Carriage Assemblies; Printed Circuit Boards; Computer Memories; Data Communication Terminals; Electronic Controls for Automated Processing and Handling of Food; Geophysical Electronic Controls for Acquiring, Controlling and Processing Seismic Data-Namely, Computers for Processing Seismic Data, Digital Plotters, Geophones, Seismometers, Accelerometers, Hydrophones, Geophone Testors and Electrical Cable, Connectors and Parts Therefor