| 摘要 |
1536804 Tee-off device K A POORTMAN 19 July 1977 [28 Dec 1976] 30312/77 Addition to 1482820 Heading A6D The invention relates to a modification of the invention of the Parent Specification in that the flashes of light are produced electronically. In the embodiment described the light sources are light-emitting diodes. |
