This is a reconstruction of the supply chain for the Western Electric produced "candlestick" style telephones of the late 1920s. Information is largely drawn from archival Western Electric/AT&T materials, as well as those of supplier companies. Some imagery is currently included for cotton and copper sources.
This is a rough draft - many details are missing or incomplete.
Map of Apple Suppliers, data drawn from Apple's supplier list (http://www.apple.com/supplierresponsibility/reports.html). Inspired to put this on Sourcemap by the "Who Supplies Apple (It’s Not Just China)" Interactive Map put together by by Tea Leaf Nation and ChinaFile.com (http://www.tealeafnation.com/2013/02/who-supplies-apple-its-not-just-china-an-interactive-map/)