For the patch itself, see July 8, 2010 Patch.
Engineer Update logo TF2
"Say you have two things: a perfectly good hand, and a brilliant inventor for a grandfather. One day you stumble across a blueprint for an amazing-as-hell robot hand meant to replace an arm-stump. Wait, you have three things: the hand, the grandfather, and a saw."
TF2 Official Blog

The Engineer Update was a major content update focusing on the Engineer. The update was announced on July 5, 2010, and was released in the July 8, 2010 Patch.

Rather than announcing new content for the update regularly, new content was announced every time 25 Golden Wrenches were found. With 100 Wrenches to be found in total, there were 4 announcements prior to the final release of the update.

The 3 weapons added were the Frontier Justice for his primary, the Wrangler for his secondary, and the Gunslinger to replace his melee weapon.

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