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| Number | Title | Issue Date |
| 6901611 | Bathtub wastewater head fitting A head fitting for a bathtub waste water drainage system is disclosed. The head fitting simplifies leak testing in bathtub waste water drainage system and eliminates the need for a separate test cap and fastening hardware for leak testing. The head fitting includes ... | 06/07/2005 |
| 6826957 | Self-contained portable air pressure decay test apparatus A portable air pressure decay test apparatus for leak testing of a sealed system includes a hollow housing, an air pump having an inlet and an outlet disposed in the housing, and a controller disposed in the housing and connected to the pump for controlling the oper... | 12/07/2004 |
| 4109533 | Tachometer Apparatus for deflecting a pointer in proportion to the rotational speed of a shaft comprises a support, a governor mounted on the support, an indicator mounted on the support and an angled calibrating lever pivotally mounted on the support and connecting... | 08/29/1978 |
