There were three generations of Neufeldt-Kuhnke suit to work in deep waters. This one is from This third generation shell (produced between with a closed circuit breathing system was safe up to a depth of 525 feet m), and had a telephone!
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This is one of those things that looks like steampunk but is actually a real device from the past. Wow. “Mr. Mac Duffee tested his formidable-looking A.D.S. to a depth of 214 feet in Long Island Sound, New York” 1911.