The Tokyo District Court has begun hearing arguments in a lawsuit brought by a Japanese parts maker against Apple over alleged patent infringements.

Shimano Manufacturing filed the suit against Apple in August claiming that it abused its market dominance by demanding unreasonable rebates on parts including pins used in charger cables for the MacBook Pro. It sought an injunction against sales of some Apple laptops in Japan, and compensation.

Shimano is demanding ¥1 billion (US$8.4 million) from Apple for infringing its patent on the pins, as well as an undisclosed amount for possible violations of antitrust laws, according to an article in the Asahi Shimbun newspaper.

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