TY - RPRT TI - The proof testing of porcelain insulators and the application of acoustic emission AU - Evans, A G AU - Wiederhorn, S M AU - Linzer, M AU - Fuller, E R PY - 1974 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS IR 74-512 DO - 10.6028/NBS.IR.74-512 ER -