Number | Date | Country | Kind |
---|---|---|---|
2534011 | Jul 1975 | DT |
Number | Name | Date | Kind |
---|---|---|---|
2592250 | Davey et al. | Apr 1952 | |
3761266 | Milton | Sep 1973 | |
3935014 | Klotzer et al. | Jan 1976 |
Number | Date | Country |
---|---|---|
1,027,146 | Apr 1976 | UK |
Entry |
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Duffin; Photographic Emulsion Chemistry, The Focal Press, 11-1969, pp. 59-60. |