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| Number | Title | Issue Date |
| 5203088 | Method and machine for the engraving of articles The engraving of an article with a curved surface is carried out at an order site. Engraving instructions are sent into computer equipment which controls an engraving machine by means of control signals which depend on the input instructions. The engravin... | 04/20/1993 |
| 4317287 | Microidentification system An inexpensive manual microidentification system includes a carrier card having the workpiece to be engraved mounted thereon and providing a surface for recording the information engraved on the workpiece; and a simple, inexpensive microengraver formed fr... | 03/02/1982 |
| 4219933 | Diffraction grating ruling engine A device for the fabrication of a concave diffraction grating wherein grating grooves are mechanically ruled on a spherical surface of a diffraction grating blank and wherein a tool for ruling the grating grooves is reciprocated along the spherical surfac... | 09/02/1980 |
| 3936942 | Optical pantograph An optical pantograph for directing light beams and the like from a source to a receiver according to the movement of a pointer. The device can be used for, among other things, directing a laser beam and the like to a target for etching patterns on a targ... | 02/10/1976 |
