Golden eight-ball projectors by Erco 1970, set of 3

Golden spherical projectors 77479 by erco in germany in the 1970s. There are 3 copies sold together. Large light fixtures on ball joints for wall or ceiling use. The aluminum rail system is a widespread patent. It receives power and the projector is quickly mounted/disassembled as required. On the second-hand market there are other forms of luminaires that mount on this type of rail. Good condition in accordance with age and use - patina of the walleye the electrical equipment is to european standards - standard e27 ceramic socket (bulbs not supplied) - connection to ground. The bulb photo gives an idea of the format and references.