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D313982 | Eilert et al. | Jan 1991 | |
D314568 | Martin | Feb 1991 | |
D314953 | Welch | Feb 1991 |
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Universal Data Systems, Inc. Advertising brochure. v. 3225 Modem. |
Integrated Network Corp. Jan. 1990 advertisement for CSU/DSU model 1056E shown in Data Communications. |