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A machine which solves the general problem of counting randomly placed objects of varying size on a surface is briefly described. It is able to accomplish this task by systematic discard of information. It is essentially a scanning device with a ``memory'' in the form of a quartz ultrasonic delay line. A ``decision-making'' element controls the discard of information and directs the counting action...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.