TY - RPRT TI - Sensitivity and current leakage of twenty-one cold cathode electron tubes, type WL-759 and thirty-one photoelectric tubes, type WL-919 PY - 1955 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS report ; 4436 DO - 10.6028/NBS.RPT.4436 ER -