Did You Know...
...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 5358540 | Exhaust cleaner for filter hoods An exhaust cleaner includes a water trough installed in the exhaust piping of a filter hood through which exhaust gas from the filter hood passes, a water heater controlled to heat water in the water trough, a chemical detergent added in water in the wate... | 10/25/1994 |
