Duplex drums! That brought back a memory...as a teenager, I subbed for a drummer one night in a jazz band, the house drums were 50's or 60's Duplex...as I recall, great-sounding drums. Then, years later, I saw the Peavey Radial Bridge drums, and thought how history repeats itself - they bore a striking resemblance to the Duplex, although I'm sure they differed in many ways.