TY  - BOOK
AU  - Howling D H
TI  - Simple 60-cps hystersis loop tracer for magnetic materials of high or lowpermeability
U1  - 621.3747 
PY  - 1956///
KW  - Frequency measurements
N1  - Photo print from review if scientific instruments,v 27,no.11,Nov.1956
ER  -