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<p>substrate for <a href="page.php?w=projection_mask">projection mask</a>s for <a href="page.php?w=photolithography">photolithography</a>.  Its UV transparency also finds use as windows on <a href="page.php?w=EPROM">EPROM</a>s (erasable programmable <a href="page.php?w=read_only_memory">read only memory</a>), a type of <a href="page.php?w=non-volatile_memory">non-volatile memory</a> <a href="page.php?w=integrated_circuit">chip</a> which is erased by exposure to strong ultraviolet light. EPROMs are recognizable by the transparent fused quartz (although</p><p>
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