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The ornamental design for a calculator keyboard module, as shown. |
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FIG. 1 is a top plan view of a preferred embodiment of a calculator keyboard module showing our new design;
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof; and
FIG. 6 is a right side elevational view thereof.
Johnston, John N., Beitler, Myron
| Patent | Priority | Assignee | Title |
| D299718, | Apr 22 1986 | GEC PLESSEY TELECOMMUNICATIONS LIMITED , | Keypad for telecommunications instruments |
| Patent | Priority | Assignee | Title |
| 3617661, | |||
| 3721778, | |||
| 3736397, | |||
| 227671, |
| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| May 18 1979 | Litton Business Systems, Inc. | (assignment on the face of the patent) | / | |||
| Oct 16 1984 | MONROE SYSTEMS FOR BUSINESS, INC A NE CORP | MELLON BANK NATIONAL ASSOCIATION | SECURITY INTEREST SEE DOCUMENT FOR DETAILS | 004321 | /0976 | |
| Nov 26 1984 | LITTON BUSINESS SYSTEMS, INC A NY CORP | MONROE SYSTEMS FOR BUSINESS, INC A NE CORP | ASSIGNMENT OF ASSIGNORS INTEREST | 004423 | /0130 |
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