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並前往https://books.google.com.tw/books?id=EQXvN6bLQj0C&pg=PA435-IA29&lpg=PA435-IA29&dq=february+10&source=bl&ots=Xn4Y_Z6OIg&sig=ACfU3U2ZS3XmJtzJf2f-DvafMxYTa3LZcA&hl=zh-TW&sa=X&ved=2ahUKEwjN-4GvuLr2AhXopIsKHfSlCWUQ6AF6BQjDAhAD

Official Gazette of the United States Patent Office

CLASSIFICATION OF PATENTS ISSUED FEBRUARY 10 , 1942 In. 12 . Gearhart . ... 2,272,430 ; Feb. 10 . Acetals , Production of polyvinyl . H. Berg . H. Berg .

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