The top lawmakers on the House China select committee pressed various semiconductor equipment makers on their business sales with China amid growing concerns about the nation’s competitive advancements in chipmaking.

The House Select Committee on the Chinese Communist Party sent letters Thursday to five American, Japanese and Dutch firms specializing in producing semiconductor manufacturing equipment. The inquires asked the companies for information on their total revenue from sales to China and a list of the top customers in these transactions.

This information will help the committee “better understand the flow” of semiconductor manufacturing equipment to China, which........

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