The Standard Electrical Dictionary
Key, Double Contact
A key arranged to close two distinct circuits, holding the first closed until the second is completed. It is used for Wheatstone bridge work.
The numerical value of key, double contact in Chaldean Numerology is: 8
The numerical value of key, double contact in Pythagorean Numerology is: 5
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"key, double contact." Definitions.net. STANDS4 LLC, 2017. Web. 23 May 2017. <http://www.definitions.net/definition/key, double contact>.