@misc{1189776, author = {J R Lepkowski}, title = {Description and performance characteristics of engineering models of visual alerting devices:}, year = {1973}, month = {1973-01-01 05:01:00}, publisher = {, National Institute of Standards and Technology, Gaithersburg, MD}, doi = {https://doi.org/10.6028/NBS.IR.73-253}, language = {en}, }