http://www.pbs.org/wgbh/amex/telephone/sfeature/index.html Forgotten Inventions http://www.pbs.org/wgbh/amex/telephone/sfeature/index.html http://www.pbs.org/wgbh/amex/telephone/sfeature/index.html "Special Feature: Forgotten Inventors" PBS: Forgotton Inventors http://www.pbs.org/wgbh/amex/telephone/sfeature/index.html "Special Feature: Forgotten Inventors" "American Experience" http://www.pbs.org/wgbh/amex/telephone/sfeature/index.html