TY  - RPRT
TI  - Circular of the Bureau of Standards no. 379: care and adjustment of folding testers of the Schopper type
PY  - 1929
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 379
DO  - 10.6028/NBS.CIRC.379
ER  -