mechanical twin

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noun Metallurgy.

a crystalline twin formed by the strain set up by an applied force.

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Origin of mechanical twin

First recorded in 1920–25

Twin buglers played “Taps” and three police helicopters flew overhead in the missing-man formation.
Funeral Protest Is Too Much for NYPD Union Boss|Michael Daly|January 5, 2015|DAILY BEAST
There were also crashes not due to either mechanical or human error but to a lack of warning of dangerous conditions.
Flight 8501 Poses Question: Are Modern Jets Too Automated to Fly?|Clive Irving|January 4, 2015|DAILY BEAST
Target was established in 1962 by the Dayton brothers as a discount offshoot of their eponymous Twin Cities department store.
Best Buy Punches Back at Amazon|William O’Connor|December 27, 2014|DAILY BEAST
Twin girls, Greta and Grace, run around the floor in circles, wearing pink playsuits with tiny pink wings attached.
A Sunni-Shia Love Story Imperiled by al Qaeda|Ruth Michaelson|December 26, 2014|DAILY BEAST

The twin entrepreneurs and stars of HGTV's Property Brothers will be taking your questions live on Tuesday, December 16 at 2pm.
Live Q&A: Drew and Jonathan Scott|The Daily Beast|December 16, 2014|DAILY BEAST
In the preceding chapter an examination has been made of the purely mechanical side of the era of machine production.
The Unsolved Riddle of Social Justice|Stephen Leacock
This hurly-burly,” said he, drawing her into a quiet eddy of the stream, “is no place for the communion of two twin souls.
The Joyous Adventures of Aristide Pujol|William J. Locke
The approach of these mechanical monsters opens up vistas thronged with shadowy forebodings.
Gallipoli Diary, Volume I|Ian Hamilton
Go carefully over the film with an oil-immersion lens, using a mechanical stage if available.
A Manual of Clinical Diagnosis|James Campbell Todd
The door to the back room opened, letting through a blend of talk and small mechanical noises.
Fee of the Frontier|Horace Brown Fyfe