Cybot Galactica Logo Banner

A logo banner for Cybot Galactica the manufactures of the famous 3PO Series Protocol Droids and may others

From Wookiepedia;

Cybot Galactica dominated the market in nonmilitary droids, especially protocol droids. The company was headquartered on Etti IV in the Corporate Sector. It excelled in marketing and design, but was also known to have expensive products. However, the wide-ranging service and support Cybot Galactica made up for this. Almost all major and minor Republic and Imperial worlds had at least one Cybot sales and service center. Because of how common their products and service centers were, mechanics had a comparatively easy time repairing and modifying Cybot droids. Like other droid manufacturers, Cybot Galactica utilized the expansive production facilities on Telti, as well as those on the planet Affa for their protocol division.[1]
Cybot Galactica was a major force in galactic history and a powerful influence in the Core Worlds and the Corporate Sector. The corporation was known for a wide range of droid models ranging from simple labor droids to advanced security models. They also produced computer equipment and electronics.

C-3PO, by far the most famous protocol droid, was built by Anakin Skywalker out of parts from scrapped Cybot Galactica droids in one of Watto's junk piles.