Tons and tons of them.

Thin Lizzy might have done it first, depending on how you're judging 'lead parts', but Scott Gorham and Brian Robertson's intertwining parts are the defining sound of their biggest hits like Jailbreak and The Boys are Back In Town

Lynyrd Skynyrd had 3 or 4 guitarists, I was surprised when I first picked up the instrument to learn that what I called the Sweet Home Alabama riff was actually 3 different parts in sync.

Fleetwood Mac almost always had multiple guitarists carrying leads. The Buckingham/Nicks era might not have, but there's a reason they replaced Lindsey with two (great) guitarists when he left.

The Eagles, Derek and the Dominos, Wishbone Ash, Quicksilver Messenger Service, the Allman Brothers, Blue Oyster Cult, Iron Maiden, Tesla...