Nathan Matteson

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The A4 wallet (2014) is minimal wallet platform designed with my partners Matthew Hall and Brian Johnson at Obstructures. It’s development was funded by a campaign on Kickstarter, and its operation is based on our patented rolling o-ring hinge. 

The design of the A4 was an iterative development on our previous A3 model, and also involved a numeric model that located the rings for an optimal balance between easy opening and secure closing.