Number | Name | Date | Kind |
---|---|---|---|
2361946 | Johnson et al. | Nov 1944 | A |
2803344 | Morrison | Aug 1957 | A |
3635340 | Dunn | Jan 1972 | A |
3739554 | Whetten et al. | Jun 1973 | A |
3820306 | Vincent | Jun 1974 | A |
4071169 | Dunn | Jan 1978 | A |
4172028 | Dunn | Oct 1979 | A |
4233037 | Pontius et al. | Nov 1980 | A |
Entry |
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“Burning Coal Superclean” Machine Design, Dec. 12, 2002 p. 45. |