the original IRD
IRD originally comprised the duo of Rod Moses and the late Ray Baldwin. I believe that's correct, their first component was a 2-bolt seatpost. A good post. I'm still riding one of the originals.
Also riding one of their triple clamp rigid forks, the legs of mine are 2000 aluminum, they also made ti legs.
The fork has movable brake bosses. On them is an IRD Rotary brake, a center pull design that uses an eccentrically mounted large roller on one arm to push against a small roller on the other arm, with a potential mechanical advantage of 30:1. Unfortunately this highest possible mechanical advantage is achieved just before the large roller slips past the small one,rendering the brake nonfunctional. So adjusting the pads to prevent this you end up with only probably a wimpy 25:1 or so.
It was the most powerful brake when tested circa '90 or so by Mt. Bike ragazine, surpassing even the WTB rollercam, which really tweaked the WTB folks at the time.
On the back of that same bike is an IRD Widget brake, a sidepull design that predates the V brake by almost a decade. It uses a toggle to vary its mechanical advantage and travel, so it doesn't require a special V brake style lever. I'm using a drop bar with a Modolo road lever and can get 1-finger lockups, and more importantly, way better modulation than V brakes so I don't lock up unless I intend to.
The old IRD made very cool stuff. They had a bike called the Stroker that was designed around I think it was 225mm length Bullseye cranks.
I believe Bigwheel has one, maybe he'll chime in about it.