Calibration devices for calibrating optical emission spectrometers, atomic absorption spectrometers and X-ray apparatus, other than for medical use; Collimators; Fiber optic instruments, namely, waveplates, laser optics and IR materials in the nature of conductive fibers, namely, high power fibers for conducting laser beams in the mid infrared wavelength range; Hermetically sealed sapphire optical window systems and electrical terminals and feedthroughs for high voltage and other harsh enviro...