Two-beam photometer with rotatable graded interference filter
Use of modulated stimulus to improve detection sensitivity for s
Variable frequency interferometer
Viewer for biological diffusion plate
Visual color comparator with integral dual dip cells
Visual method of locating faults in printed circuit boards
Wavelength driving device for use in monochromators
Wire bonder
Work locating system and method with temperature and other compe
Workpiece, and container and contents, inspecting apparatus and
Zone plate alignment marks