I just found a tube full of these vintage op amps in a collection of junk I recently bought.
The MC14575 is a single chip with two comparitors and two op amps. Already a cool idea. But, it has two mor pins than a standard quad package. Each pin allows you to select your bias current. The more current, the faster the amplifier and higher GBW. You can have a low power device or a high performance device. Perfect for a DIY. Simply ahead of its time.

The datasheet shows two additional permutations - quad op amp and quad comparitor in addition to my dual op amp + dual comparitor chip.

http://pdf.datasheetcatalog.com/datasheet/motorola/MC14574P.pdf

 

Pretty neat! When I was an R&D tech, my group had a small supply of what my Boss called zip chips. They were die with uncommitted transistors and passive devices. To make custom devices for breadboarding, we could draw up a bonding diagram and a lady would wire it up for us.