72288252
Jan 8, 1968
Jul 8, 1969
VARI-LIGHT CORPORATION
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PHOTOTROPIC SOLUTION AND THERMOTROPIC SOLUTION
LACQUERS
PHOTOTROPY KIT, PHOTOTROPIC GLASS, PHOTOTROPIC PLASTIC, SENSITIZED PHOTOTROPIC PAPER, AND THERMOCHROMIC FILM
PHOTOTROPIC GLASS AND THERMOCHROMIC FILM