TY  - GEN
AU  - Robert E Stephens
C2  - , National Institute of Standards and Technology, Gaithersburg, MD
DA  - 1942-01-01 05:01:00
DO  - https://doi.org/10.6028/NBS.CIRC.437
LA  - en
PB  - , National Institute of Standards and Technology, Gaithersburg, MD
PY  - 1942
TI  - Circular of the Bureau of Standards no. 437::optical and mechanical characteristics of 16-millimeter motion-picture projectors
ER  -