Number | Name | Date | Kind |
---|---|---|---|
D103176 | Knoll | Feb 1937 | |
352532 | Fox et al. | Nov 1886 | |
520373 | McClure | May 1894 | |
3127650 | Seward | Apr 1964 | |
4104811 | Salomon | Aug 1978 | |
4253217 | Marzocchi | Mar 1981 | |
4559678 | Birkenstock | Dec 1985 | |
4812064 | Hatakeyama et al. | Mar 1989 |
Number | Date | Country |
---|---|---|
661416 | Jul 1929 | FRX |
10730 | Aug 1880 | DEX |
39125 | Apr 1887 | DEX |
Entry |
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North Safety Equipment Product Literature for RP-400 Respirator Selection Guide (1990). |