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these resin blocks offer a glimpse into the past of educational tools
and selenium
5 and a density of 2
allowing the organism to withstand harsh environmental conditions
Optical Screen with Hole/Pointer these resin blocks offer aVersatile Design: The Optical Screen with Hole Pointer offers a dual functionality as both an object and receiving screen. Metal Frame Construction: The sturdy black metal frame measuring 150 x 100 mm comes with an aperture and index point. Removable White Card: The included white card screen features an aperture, allowing it to be used as an object, or inverted as a receiving screen. Practical Base: Mounted on a solid base measuring 100 x 50 mm for
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