Antique Document 1921 Patent Certificate No.1387739 Combustion Gases Safety

Description

From the Estate of the Inventor' daughter that would've been 107 years old in 2021. The Patent concerning the safety of Combustion is dated August 16, 1921. It was carefully stored with other papers of her father Mr. Charles M. Shipman. Please examine the pictures for details.
Antique Document 1921 Patent Certificate No.1387739 - Combustion Safety
Antique Document 1921 Patent Certificate No.1387739 - Combustion Safety
Description
From the Estate of the Inventor' daughter that would've been 107 years old in 2021.
The Patent concerning the safety of Combustion is dated August 16, 1921.
It was carefully stored with other papers of her father Mr. Charles M. Shipman.
Please examine the pictures for details.​
Click images to enlarge
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