The viewer can take his or her own meaning from the drawing, but allow us to point out the inset illustration labeled “Overhead Deck Cable.” It shows 4-10 neoprene-covered wire with power outlets and “lites” rendered in such charming style. (Neoprene was invented by Dupont in 1930.)
Traces of Double J Manufacturing Co., Inc.–which opened in 1949–turn up in a web search. Double J is characterized as a producer of industrial and commercial machinery and equipment. There’s even a phone number, but dialing 913.342.4400 yields, “We’re sorry, you have reached a number that has been disconnected or is no longer in service.”
Nevertheless, this excellent drawing commemorates the company.