Lisco & Fidelity are basically the same thing. There are some minor differences in both over the decades, with the later holders having less brittle darkslides than the earlier ones. It' all I've ever used, and still totally reliable. I treated them with antistatic spay and routinely blow them clean. Don't leave em in hot sun where they might warp. A number of the 8x10 ones I've converted to precision adhesive holders. And I have just one aluminum Hoffman 8X10 holder in the lab, which I modified for vacuum drawdown.
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