| http://www.w3.org/ns/prov#value | - Salt and pepper shakers can be made from a variety of materials, including plastic, glass, metal, and ceramic.[1] Salt shakers became increasingly common after anti-caking agents were introduced by the Morton Salt company in the 1920s.[2] The Great Depression of the 1930s boosted the popularity of salt and pepper shakers as global ceramics producers concentrated on inexpensive items.[2]
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