The phrase "a main branch" is correct and usable in written English.
It can be used to refer to a primary or significant division of an organization, system, or structure.
Example: "The company has several divisions, but the main branch is located in New York City."
Alternatives: "a primary branch" or "a principal branch".
The robbery took place at a main branch of Al-Rafidain Bank in the Karada neighborhood of Baghdad.
He prunes each one to a main branch, or oblique cordon, bent at a 45-degree angle.
The T-junction consists of a main, branch and a run with their cross section of 0.6 mm×0.6 mm.
The fracture is distinguished by a main branch of an approximately N-S direction and smaller side branches of E-W, NE-SW and NW-SE directions.
During 2013-2015 an expansion of the China JinPing underground Laboratory (CJPL) will be undertaken along a main branch of a bypass tunnel in the JinPing tunnel complex.
But on Sunday, at a main branch of Laiki Bank — one of Cyprus's two major financial institutions — employees were seen inside the darkened building hovering over computers and filling machines with bills.
The feature was teased in a beta a couple months back, but is now a main-branch feature for the game.
Indeed, there is no consensus on best stent placement scenario [11], no understanding as to whether DES will behave in bifurcations as they do in straight segments, and whether drug from a main-branch (MB) stent can be deposited within a side-branch (SB).
Since the 1960s a third main branch, dynamic meteorology, has emerged.
Econometrics is a third main branch of economics, devoted to the empirical estimation, elaboration, and to some extent testing of specific microeconomic and macroeconomic models (but see Summers 1991 and Hoover 1994).
The essence of the CLP is to sell off two libraries, the mid-Manhattan and the science, industry, and business library, and consolidate their functions into a reconfigured main branch.
