TY  - GEN
AU  - Wilson, Bruce L
AU  - Tate, Douglas R
AU  - Borkowski, George
C2  - , National Institute of Standards and Technology, Gaithersburg, MD
DA  - 1946-01-01 05:01:00
DO  - https://doi.org/10.6028/NBS.CIRC.454
LA  - en
PB  - , National Institute of Standards and Technology, Gaithersburg, MD
PY  - 1946
TI  - Circular of the Bureau of Standards no. 454::proving rings for calibrating testing machines
ER  -