ADF Engineering - Website

Building 13 is a small product design and development company—led by Nathan Gross, and proudly located in ~~Cincinnati~~ Dayton, Ohio.

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ADF Engineering - Website

Updated: February 17, 2026 Originally posted: September 5, 2009

Proposed site refresh for adfengineering.com.

Proposed website updates for ADF Engineering - Home Page

Proposed website updates for ADF Engineering - Contact Page

Current site design - 2007