On 12/04/2016 23:06, michael adams wrote:
"Rod Speed" wrote in message
...
However some inventions seem to wait for ever.

Can't think of any important one that has.

Here's one


https://fetch.co.uk/chuckit-sport-18...FbEy0wodcX0C2w

Ball launchers for when taking the dog to the park. One piece
plastic mouding with added bits must cost about 50p to make.

Probably can't be patented but its surprising nobody
thought of them earlier.

I think the atlatl is probably prior art on that.