The phrase "a major device for" is correct and usable in written English.
It can be used to describe an important tool or method used for a specific purpose or function.
Example: "The smartphone has become a major device for communication in the modern world."
Alternatives: "a key tool for" or "an essential means for".
This man-in-the-middle technique isn't new in principle, but having it as the default mode of communication for a major device is.
Dower has long ceased to be the major device for protecting a surviving spouse against disinheritance because it applies only to real estate and thus offers no security at all in the situation where the wealth of the predeceasing spouse was only or mainly composed of personal property such as savings or shares of stock.
It can be foreseen that Google Glass will become the major device for supporting smart learning from the perspective of anytime and anywhere learning.
This elaborately sculpted stone observatory, built in the 1720s, boasts 14 major devices for measuring time, predicting eclipses, tracking stars, ascertaining declination of planets and determining the beginning of the monsoon season.
In addition, different pitch contours are used as major devices for the composition of compound units that contain pieces of information about the game and correspond to steps in the game, making the explanation easier to follow for recipients.
One of the major devices for maintaining chromosome stability during cell division is the CPC.
In his dissertation, Mincer developed what then became known as the "schooling model", which attempted to use human capital (education and training) as a major explanatory device for empirical findings such as a higher remuneration for occupations requiring more training and a more pronounced lifetime income pattern as a result of training on the job.
That logo has become a major marketing device for an extraordinary range of products and services.
The Bantustans were a major administrative device for the exclusion of blacks from the South African political system under the policy of apartheid, or racial segregation.
This has been shown to be detrimental to material properties and a major drawback for device applications27 although there was no clear explanation reported for these phenomena.
