TY  - RPRT
TI  - Letter Circular 475: testing of electrical instruments, meters, and instrument transformers (revision of Letter Circular 222 and 342)
PY  - 1936
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 475r1936
DO  - 10.6028/NBS.LCIRC.475r1936
ER  -