Where’s Marty? Checking Out A Baltimore County Man’s Electrifying Collection

Hello everyone!
Today we visited a local man who is an international lighting historian. By trade, Chad Shapiro is a lighting designer, but his passion lies in the history of it all. And he assured me that his hobby and work are totally unrelated.
His Baltimore County showroom doubles as a backdrop for part of his historic collection. But he brought out of his rather serious vault a couple of items that one could consider Holy Grail-like objects in the history of lighting. One is a letter from T