Cool Hardware from Grandpa's workshop. This is a matching pair of Heim end joints. in perfect condition, never used, no wear and no corrosion. These date back to the 1940s or early 1950s. Grandpa was a motor pool mechanic in WWII and was a machinist from 1945 to 1969. These Heim joints are clearly marked Heim USA Patent Applied For. Which means they were manufactured before the patent was granted in the mid 1950s. Also marked HM-3, this is the model number and is still being produced today.