...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 4028537 | Product processing system with price printer A printer is controlled in response to product identifying codes carried on products being processed to imprint price information on the product for the benefit of consumers.... | 06/07/1977 |
| 4002886 | Electronic price display unit This invention pertains to an electronic price display unit which can be remotely addressed and in which the price displayed can be remotely set. Such a device is particularly useful in a retail sales business in a system employing a central computer, poi... | 01/11/1977 |
| 3961747 | Commodity identification apparatus A commodity identification key carrying apertures arranged in rows and columns for organization of commodity identification, parity checking, and clock control information, provision for manually controlled reading of the commodity identification informat... | 06/08/1976 |
| 3947660 | Cash register computing system Each item in a transaction has a card or ticket having markings signifying its price and category in machine readable form. As each item is purchased, the ticket is inserted into an automatic read-out system. The price and category markings are transduced... | 03/30/1976 |