These small tables were originally designed to be a surface from which one could eat a meal while watching television.
The phrase tray-table can also refer to a fold-away tray, such as those found in front of airline seats.
A set of four TV tables were sometimes sold mounted on a small rack where they could be hung when not in use.
The grips clipped on to the legs, which could be opened up to support the tray, or collapsed for stackable storage.
As times changed, so did construction techniques, and today TV tray tables are often manufactured using blow-molded plastic or wood.