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The Early Office Museum researches typewriters, adding machines, staplers, pencil sharpeners, office furniture, filing systems, and other business technology using original documents, artifacts, and historical photographs.
NewAlmaden.org combines park information, museum material, archival links, photographs, newsletters, trail history, and preservation work around California's New Almaden mercury mines and the communities that grew around them.
Mike's Electric Stuff preserves photographs, operating details, manuals, and firsthand notes about mercury arc rectifiers: giant glowing electrical valves that converted AC to DC before solid-state electronics replaced them.
David Kitching's Brocross site hosts Old Bricks: History at Your Feet, a community-built reference with more than 10,000 named brick images tied to makers, works and industrial history.
Coolspring Power Museum's Otto 175 hp feature documents a 25-ton single-cylinder natural-gas engine, its 20-ton Deane pump, Brookville Water Works history, specifications, and museum reconstruction.
MANWEB Remembered collects staff magazines, technical documents and power-station material from the Merseyside and North Wales Electricity Board, whose records became dispersed after privatization.
Racinehistory.com has preserved local timelines, manufacturing history, community stories and Gerald Karwowski's decades of collecting around Racine County, Wisconsin.