handcarts and sweet potato baking cars

When checking the exact location of the Jungang Market near Sindang station of the Line 2 introduced in an Ohmynews feature, I ended up on the site of the handcart manufacturer Sinjungang Riôk'a, which has many kinds of carts and sweet potato baking drums in its selection. All-around handcart (다목적소형리어카) Snack cart (분식리어카) Sweet potato baking cart, uses both firewood and gas. Also chestnuts can be baked. (군고구마 리어카) Since when has sonsure become riôk'a? When South Korea modernized? Wondering what's behind the Korean word, I checked the Standard Dictionary of Korean: it comes from rear car, which is I guess from having the cart attached to the rear of a bicycle. So riôk'a, "rear car" has come to designate also a handcart, sonsure. Categories at del.icio.us/hunjang: businesskeepers ∙ culturalhistory ∙ modernization