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| Number | Title | Issue Date |
| 5090127 | Safety compass A safety compass comprising first and second leg members. The leg members have a pivot opening and an arcuate slot formed in an upper portion thereof. The upper end portion of the leg members are pivotally attached together by a handle member having a pai... | 02/25/1992 |
| 4858326 | Geometric instrument and method of making same A pair of compasses has legs articulated by a pivot pin. Each leg is of moulded plastics with a strengthening metal insert provided in each leg. Projecting circular parts of the inserts are overlapped and articulated together by the pin within a bow top.... | 08/22/1989 |
| 4146965 | Drawing instrument A drawing instrument comprises a pair of die-cast limbs pivotally connected together to form an assembly at the inner ends thereof. A bow top has an interior hole and fork limbs having inside faces embracing the assembly of the ends. A centralizing member... | 04/03/1979 |
| 4104801 | Drawing instrument A drawing instrument comprises a pair of limbs pivoted together at their inner ends to form an assembly. A bow top has an interior hole and fork limbs embracing the assembly of the inner ends of the pivoted limbs. The fork limbs include pivot holes for re... | 08/08/1978 |
