Number | Date | Country | Kind |
---|---|---|---|
1-237758 | Sep 1989 | JPX | |
1-340856 | Dec 1989 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
4988418 | Beck et al. | Jan 1991 |
Entry |
---|
Patent Abstracts of Japan, JP-A-56-47614, Apr. 30, 1981, "Automatic Oil Replacing Device". |
Patent Abstracts of Japan, JP-A-61-259158, Nov. 17, 1986, "Method for Detecting Acidity and Basicity of Oil and Reference Electrode". |
Patent Abstracts of Japan, JP-A-62-25250, Feb. 3, 1987, "Detection of Acidity and Basicity of Oil and Reference Electrode". |
Patent Abstracts of Japan, JP-A-61-20851, Jan. 29, 1986, "Device for Judging Degradation of Lubrication Oil". |