That is about where the Gerber sign biz started. There were some earlier models but the 4B became the standard. The story goes that management and engineers were looking for a new project and after combing the "yellow pages" they found so many sign maker adds they visited one in Hartford, Connecticut. Gerber being in the X/Y plotter biz and seeing what signmakers were doing the next step became a no brainer.
The story I heard was that management was looking for Shoes in the Yellow Pages but the page was torn out. The next page was Signs and the rest is history.
I started with a SignMaker 3 in 1983. It had no autokerning so you had to draw out each line of text using a pen on plotter paper, correct it, draw it again, correct it again until it was right. The SM 3 did have a tangential tool head as did all subsequent models although the original patent used a thermal hot tip to melt/cut the vinyl.
At one point we had three of them with three operators running all day to get the work out. When we switched to SuperSprints which ran five times faster, we found to our surprise that productivity didn't change very much ... only the workflow. With the slower Signmakers our operators would weed and mask one job while the next one was cutting. With the faster SuperSprints, we ended up adding a separate weeder for each machine and we were able to produce more work but the productivity per person was no better.
As plotters, even these old SignMakers were fine. The real problem in those days was that there was no way to save a job. We had to keep detailed workorders of all the settings, materials, text etc. to be able to handle repeats. Gerber was pushed by competitors like Technoarts to finally put a PC in front of their plotters to setup, save and send the jobs. Once that happened, the industry accepted the technology in a big way.