h1. Links

h2. General Information

"Open Source":http://en.m.wikipedia.org/wiki/Open_source
"Open Design":http://en.wikipedia.org/wiki/Open_design
"Prior art":http://en.m.wikipedia.org/wiki/Prior_art
"Copyright":http://en.m.wikipedia.org/wiki/Copyright
"Patent":http://en.m.wikipedia.org/wiki/Patent

h2. Manufacturing 

"Metal Casting":http://en.m.wikipedia.org/wiki/Metal_casting
"Extrusion":http://en.m.wikipedia.org/wiki/Extrusion
"Plasma Cutting":http://en.wikipedia.org/wiki/Plasma_cutting
"CNC Routing":http://en.wikipedia.org/wiki/CNC_router

h2.  OpenSource Design Software

"LibreCAD":http://librecad.org/cms/home.html
"QCAD":http://www.qcad.org/en/

h2.  Material Suppliers

h3. Stainless Steel Barrels

"Bubbas Barrels":http://www.bubbasbarrels.com/55-gallon-stainless-steel-barrel-open-head
"Freund Container":http://www.freundcontainer.com/open-head-stainless-steel-drums-type-304-ss/p/vFM401/

h3. Innovation

"Innovative HydroBubble anchor updates one of man's earliest inventions":http://www.gizmag.com/go/3653/