I don't know, but there is an open source tractor design: http://opensourceecology.org/wiki/LifeTrac http://opensourceecology.org/wiki/LifeTrac Primitive but

I don't know, but there is an open source tractor design: http://opensourceecology.org/wiki/LifeTrac http://opensourceecology.org/wiki/LifeTrac Primitive but think of Linux when it was released. It's part of the Global Village Construction Set, open source machines that could make up the technological basis for a civilization: http://opensourceecology.org/wiki/Global_Village_Construction_Set http://opensourceecology.org/wiki/Global_Village_Constructio...