Manufacturer of diffraction gratings, spectroscopes and educational science equipment
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TE219 (9 Slides) * Six slides of 1 to 6 slits TE219A(18 Slides) * Six slides of 1 to 6 slits TE219B(13 Slides) * Six slides of 1 to 6 slits |
These are all individually mounted in slide frames
and protected by two glass plates. |