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The inner slot principle of this box dates back to at least the late 1800s, when it was originally used in a small cup. A description of it appears under the title "The Black Cup" in // | The inner slot principle of this box dates back to at least the late 1800s, when it was originally used in a small cup. A description of it appears under the title "The Black Cup" in // | ||
- | The inner slot principle was adopted to coin boxes sometime in the twentieth century. Allen Zingg, in // | + | The inner slot principle was adopted to coin boxes sometime in the twentieth century. |
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