A Mason jar is a glass jar used in canning to preserve food. It was invented and patented by John Landis Mason, a Philadelphia tinsmith in 1858. They are also called Ball jars, after Ball Corp., a popular and early manufacturer of the jars; fruit jars because they are often used to store fruit; jam jars or generically glass canning jars. While largely supplanted by other methods for commercial mass-production, they are still commonly used in home canning.

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