| Signature mark | NL 174/4101 |
|---|---|
| Subject | Glasplatte |
| Title | Unbekannt. Evtl. Versuche zur Funkenentladung. Beschriftet mit: "Br (?), a, b" |
| Date | o.D. |
| Formal information |
Format (HxB):
11,4x12,2 cm |
| Rights notice | CC BY-SA 4.0 |