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104. Rejection filter. Instructions for D2106 rejection filter.

107. Wareguides. All-metal dummy load for waveguide.

108. Interferometers. Penn State 1-1 Michelson-Twyman interferometer and its use in determining conformance with design and in quality control of lenses, prisms, and telescopic systems [with Interferometer bibliography]; by Howard S. Coleman and David G. Clark.