Some of these special vacuum tube devices were really hard to make and required a lot of physical skill to make by hand. My wife's grandma actually did that, m

Some of these special vacuum tube devices were really hard to make and required a lot of physical skill to make by hand. My wife's grandma actually did that, making special vacuum tubes for a tech company after WWII up until she retired in the 60s. That was a highly skilled job and the family legend is that grandma was so good, even after she retired, the company would sometimes need to beg her to come back for a day and make something particularly tricky.