Number | Name | Date | Kind |
---|---|---|---|
1909856 | Dolder | May 1933 | |
2441866 | Cantor | May 1948 | |
3454962 | Hind | Jul 1969 | |
3454964 | Brinkhoff | Jul 1969 | |
3588914 | Ihnat, Jr. | Jun 1971 | |
3637040 | Gorman | Jan 1972 | |
3644939 | Beguin | Feb 1972 | |
3661225 | Anderson | May 1972 | |
3728741 | Lepor | Apr 1973 | |
3823713 | Shah | Jul 1974 | |
3908200 | Lundin | Sep 1975 | |
4094303 | Johnston | Jun 1978 | |
4174155 | Herman | Nov 1979 |
Entry |
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M. R. Forrest, Laboratory Dev. of an Amplitude-Sensitive Ear Plug, Oct. 1969. |
M. R. Forrest, R. R. A. Coles, Problems of Communication and Ear Protection in the Royal Marines, (1970). |
J. Zwislocki, New Types of Ear Protectors, (1952). |
A. M. Martin, Dependence of Acoustic Attenuation of Hearing Protectors on Incident Sound Level, (1979). |