Machine Design Magazine April 1975 Penton Electric Motors & Controls Reference

Machine Design Magazine February 1973-1974 Penton Plastics/Elastomers Reference

August 1972 Dirt Bike Magazine, Sand Riding, Maico 400, Penton 125 Enduro,

Machine Design Magazine Nov 1972 Engineering Equipment Penton Engineering

Vintage 1972 1973 Machine Design Magazine Engineering Equipment Reference Issue

Machine Design Magazine June 1976 Penton Mechanical Drives Reference Issue

Machine Design Magazine June 1973-1974 Penton Mechanical Drives Reference Issue

1978 MACHINE DESIGN MAGAZINE, Reference issue, Motors, Relays & Switches, Solid