Fredy Anderegg, Josef Furrer, Heinz Dappen: Printed circuit assembly. Autophon, Oblon Fisher Spivak McClelland & Maier, August 6, 1985: US04533787 (34 worldwide citation)

Certain regions of a printed circuit assembly having mechanically laid wires are formed of two parallel sheets of polyimide film, the circuit assembly being flexible in those regions. The edges of these sheets of film are secured in the region of the edges of the rigid parts of the assembly by means ...