...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 4480706 | Automatically determining the test weight per bushel of grain An apparatus for automatically determining the test weight per bushel of grain utilizes the principal components of the standard approved test, namely a stoppered bottom hopper, a measured quart kettle and a stroker. The operation of the stoppered bottom ... | 11/06/1984 |