| http://www.w3.org/ns/prov#value | - ron or canvas. asa for fittings, backyard foundries and small lathes caqn be employed here. in any case it all requires a good basic education along with other basic skills that can maintain a certain level of tech within your survival comunity or collective. the book the boy electrician contains many self made projects including homemade batteries, telegraphs and telephones. hope this be of use
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