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| Type | Company |
| Location | Germany (Central Europe) |
| Industry | Precision Engineering and Optical Industry |
| Holdings | Newspaper clippings: 1971-1991 Annual reports: (1917 ?),1919/20, 1921/22, 1922/23, 1924/25-1941/42,1947/48-1970/71, 1972,1974, 1975,1978-1989 |
| includes | Porta Micromechanic AG – 1991; Rodi & Wienenberger AG – 1988; ROWI |
| URI | https://pm20.zbw.eu/folder/co/066401 |
| ID | co/066401 |