... 高效筛粉机 efficient power sifter 筛粉机 sieving machine ; sifting machine ; powder sieve ; powder screen 片子筛粉器 Tablet powder sifter ...
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blue powder screen 蓝粉筛
Jade Screen Powder 玉屏风散
modified jade screen powder 玉屏风散
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As you turn the knobs, the stylus is actually etching the powder from the screen, not drawing on it.
FORBES: How Does An Etch A Sketch Work, Anyway?
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