Abstract: An electrical wiring harness is formed as a flat tape by securing individual leads side-by-side by a bonding material which is itself in the form of tape. With the bonding material in a potentially bond-forming condition, for example softened by heat, the leads and the bonding material are combined by pressure in a roll nip. It is known to lay the leads out along a work top and move a heating and combining unit along the leads to form the harness. However, the machine is very long, requires turntables at each end to turn the combining unit, and leaves the harness in an inconvenient form for further handling. The leads and bonding material 12 are drawn past combining means 40, 24, 26 by a winding drum 22, which winds up into the form of a coil a harness so formed.