TY - RPRT TI - Disclosures on magnetic tape handler, focus detector, multi-pen recorder, signal averaging filter, electrostatic RMS voltmeter, back-up ring for O-rings, and low temperature solid state thermometer. Editors: David Robbins and Alvin J. Englert. AU - Robbins, David PY - 1966 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS TN 287 DO - 10.6028/NBS.TN.287 ER -