[Patent number?] 452,913, for a septuplex telegraph, held by T. A. Edison, of Menlo Park, N. J.
1911, Frederick Randolph Bailey & Adam Marion Miller, Text-book of Embryology, W. Wood And Company, Pages 134-135
Two completely separated placentae with distinct branchings of the umbilical vessels to supply them are known as placenta duplex. Placenta triplex and up to placenta septuplex have been described.
1952, American Petroleum Institute, Annual Meeting Papers, page 86
In the early stages, even a small septuplex pump of the type chosen was too large at rated speed, and we needed to reduce speed to about 40 [...]
1958, Petroleum Engineer for Management (volume 30, page D-6)
The same design includes a septuplex plunger pump that delivers up to 1000 gpm at 1000 psi (5 in. by 6 in. by 300 rpm by 750 hp).
2013, Anthony Ossa-Richardson, The Devil's Tabernacle: The Pagan Oracles of Early Modern Thought, Princeton University Press, page 63
This fact provides the occasion for an analysis of demonic knowledge. Moebius elaborates the mediaeval triplex acumen into a septuplex acumen, deriving the Devil's foreknowledge from a knowledge of natural causes, a grasp of human nature and mores, his own intentions to act, revelations from God and from the prophets, and long observation of the 'fatal periods', as well as his own celerity and intercourse with other demons.
