Number | Name | Date | Kind |
---|---|---|---|
D191396 | Weber, III | Sep 1961 | |
D228911 | Gatter | Oct 1973 | |
D241847 | Jones | Oct 1976 | |
2578827 | Munnecke | Dec 1951 | |
2738225 | Meek | Mar 1956 | |
4063665 | Schneider et al. | Dec 1977 |
Entry |
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Submicron Air Filter-"Heating & Air Conditioning Contractor"-Aug. 1968, p. 54. |