IDT ISODENSITRACER

TWO-DIMENSIONAL DIRECT RECORDING INSTRUMENTS-NAMELY, ISOPHOTOMETERS, MICRODENSITOMETERS AND STEPPING ATTACHMENTS; AND PARTS AND ACCESSORIES FOR THE SAME-NAMELY, AUTOMATIC PROGRAMMERS, SPECIMEN TABLE DRIVES, RECORDING TABLE ATTACHMENTS, RECORDING PEN ASSEMBLIES, PEN HOLDERS AND ACTUATORS, PULSE COUNTERS, APERTURE ADJUSTORS, VIGNETTING CONTROLS AND OPTICAL WEDGES; AND RECORDING MEDIA ADAPTED FOR GRAPHIC MARKING FOR USE WITH SAME