(j) the term “permanent establishment,” when used with respect to an enterprise of one of the territories, means a branch, management, factory, or other fixed place of business, a mine, quarry or any other place of natural resources subject to exploitation. It also includes a place where building construction is carried on by contract for a period of at least one year, but does not include an agency unless the agent has, and habitually exercises, a general authority to negotiate and conclude contracts on behalf of the enterprise or has a stock of merchandise from which he regularly fills orders on its behalf. In this connection
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(i) an enterprise of one of the territories shall not be deemed to have a permanent establishment in the other territory merely because it carries on business dealings in that other territory through a bona fide broker or general commission agent acting in the ordinary course of his business as such,
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(ii) the fact that an enterprise of one of the territories maintains in the other territory a fixed place of business exclusively for the purchase of goods or merchandise shall not of itself constitute that fixed place of business a permanent establishment of the enterprise,
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(iii) the fact that a company which is a resident of one of the territories has a subsidiary company which is a resident of the other territory or which carries on a trade or business in that other territory (whether through a permanent establishment or otherwise) shall not of itself constitute that subsidiary company a permanent establishment of its parent company.