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| Number | Title | Issue Date |
| 5177874 | Gage for hex head fasteners A gage for measuring and displaying the dimensional distance across the flats of a hex head of a hex head fastener having a rotatable handle attached through a shaft to a gear. The gear engages racks of a movable jaw having faces which engage the flats of... | 01/12/1993 |
| 4947558 | Hand held measuring device A hand held measuring device for measuring the size of small objects such as nuts, bolts, and the like. The device includes both an English measuring scale and a Metric measuring scale and may be used to gauge the size of either a Metric or an English sta... | 08/14/1990 |
| 4388759 | Electrocardiogram caliper A caliper calibrated for the direct reading of electrocardiogram tracings. Each arm of the caliper is calibrated and is read by indexing the calibration against a curved index line on the opposite arm which is varied by the spacing between the caliper poi... | 06/21/1983 |
