Plug-o-(d)rama

While researching a subject for his monthly Retronics piece in Elektor my colleague Jan Buiting stumbles upon all sorts of oddball items that have existed in the world of consumer electronics, with a slight bias towards ancient Philips audio and TV equipment. A while ago Jan showed me a random collection of plugs collected over the years. Being too young to have witnessed the actual use of any of these plugs, I was curious to know their intended use ‘in the old days’.