国立アメリカ歴史博物館のインスタグラム(amhistorymuseum) - 6月22日 10時21分

Our new patent model case is open. You used to have to submit a small model of your invention with your patent application, a boon for historians but a major storage challenge. This improvement on the rotary printing press caught our eye.

[BIHAKUEN]UVシールド(UVShield)

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