See the super simple method for dating and valuing antique Mason jars
Kerr self-sealing jars and the Kerr Economy were created in Alexander H. Kerr also founded the Hermetic Fruit Jar Company in the same year. San Francisco man Julius Landsberger patented metal lids fastened onto a composition gasket. Kerr used the patents to create a revelation in preserving food. Kerr, in , created a flat metal disc lid to fit onto a Mason jar to use with other canning jars. Inspect the jar from bottom to top.
The official name was changed in to Kerr Glass Manufacturing Company. Kerr is most well known as producers of several kinds of fruit jars used for home canning. They also produced large quantities of other types of glass containers, especially in later years.
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