| Date | 1840 |
| Author | Anon. |
| Contribution | Microscopists used thin glass cover-slips to cover objects on microscope slides. |
| Reference | Bradbury |
| Notes | This entry does not refer to any single year or single author, but rather to the fact that cover-slips were increasingly used from this time. See 1820. |
| Category | Microscopy |
| Pathogen Class | General |
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