- 2005.005.4.010
- Unidad documental simple
- [ca. 1960]
Item is a reflected and incident light meter powered by selenium photo cell.
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Descripción archivística- 2005.005.4.009
- Unidad documental simple
- 1968
Item is a reflected light and incident light meter with diffuser; powered by 2 Mallory MN 625 G mercury cells.