[GreenKeys] Motor start control

[Dave Horsfall]

On Fri, 3 Oct 2014, John Nagle wrote:

> The circuit uses a 555 timer chip, which was apparently considered a 
> novel idea at the time.  I looked at the schematic on the first page of 
> the patent, and thought "This guy re-invented the 555".  No, he just 
> used one, as it says in the patent text.

I remain astonished that such obvious concepts can be patented.

-- Dave vk2kfu