The Standard Electrical Dictionary
Signals, such as railroad signals or semaphores, moved by compressed air, which is controlled by valves operated by electricity. The House telegraph, which was worked by air controlled by electricity, might come under this term, but it is always understood as applied to railroad signals, or their equivalent.
The numerical value of electro-pneumatic signals in Chaldean Numerology is: 4
The numerical value of electro-pneumatic signals in Pythagorean Numerology is: 9
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"electro-pneumatic signals." Definitions.net. STANDS4 LLC, 2017. Web. 17 Dec. 2017. <http://www.definitions.net/definition/electro-pneumatic signals>.