(Photo: Vintage Technics)
Before the Walkman, the Discman, and the MP3 player, there was the Emerson Wondergram. This battery-powered record player manufactured by General Electric in the UK from 1960 to 1965 played 33 and 45 RPM records. GE marketed it as "the world's smallest record player." It measured about 8x4x2 inches. You can occasionally find one for sale on eBay.
-via Messy Nessy Chic