What does it take to get an exclusion from US tariffs? More to the point, what do a breast pump, a soldering iron, a guitar tuner and a salad spinner have in common?

Each of these items has been granted an exclusion from tariffs by the Office of the US Trade Representative, and Naomi Ng heads off on a hunt for the Hong Kong engineer who owns the patent for the salad spinner.

Her search brings her to the office of Gigi Wong, and an education in what the salad spinner can tell us about…