This is the label on the front of one of the Interface Message Processors that managed the original ARPANET, way back, when the wizards stayed up late. It's a long time since routers were this big, and had this many controls on their front panel. It rather reminded me of a similar label on Tim Berners-Lee's NeXT cube at CERN.
The Computer History Museum in Mountain View is a fascinating place, and it's well worth taking the docent tour. The guides are all experts in their fields, and all have long histories in the technology industry. Anecdotes abound, shedding light on the hidden corners of the industry's histories.
Well worth a visit.