| Results | |
| Name | Year of Publication |
| Gundlach, Ernst | 1989 |
| Gundlach Optical Co. | 1888 |
| Gundlach, Ernst, Son & Co. | 1898 |
| Gundlach-Manhattan Optical Company | 1912 |
| Gundlach-Manhattan Optical Company | 1912 |
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You may also want to consult: Basic Sources for Rochester History