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bug screen made by photochemical etching process QIAOSHI specializes in the manufacture of light gauge metal parts. The photo etching process (also called photo chemical etching and photo chemical milling) allows us to produce intricate metal components with close tolerances that are impossible to duplicate by other production methods.QIAOSHI is setting industry standards for the manufacture of encoders, masks, filters, lead frames, flat springs, strain gauges, laminations, MicroEtch Screens, chip carriers, step covers, fuel cell plates, heat sinks, shutter blades, electron grids, fluidic circuit plates, reticles, drive bands, haptics, and shims