I googled a little bit and found the following:
>Royal Cords are cords used in applications where flexibility is very important. They are used in rugged applications such as vacuum cleaners, motors, portable tools and others where there is constant
movement. Construction is copper followed by PVC insulation, then PVS bedding and a final PVC sheath.
These cords are manufactured by Marton Wires & Cables, Manila, Philippines.
http://www.marton.com.ph/index.html
