It was the first manufacturing optical firm in St. Louis and provided all manner of spectacles, opera and field glasses, telescopes, microscopes, artificial eyes, drawing instruments, magic lanterns and stereopticons.
[1][2] The company also provided a full line of mathematical and surveying instruments[3] as well as providing a repair service for optical apparatus.
[4] Mr. Erker was one of the official photographers of the 1904 World's Fair.
Erker's also supplied Charles Lindbergh with the goggles that he used in his 1927 transatlantic flight in The Spirit of St.
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