"An ancient conveyor with strange markings on the side... has very tall walls and works faster than regular conveyors."
The Ancient Conveyor is a Twitter-exclusive conveyor that you can only obtain from codes. These codes usually give around 15 conveyors. This conveyor is known for having a fast conveyor with high walls. The symbol on the walls is the Twitter logo which can be difficult to view most of the time due to the lack of contrast in the background.
Codes for the Ancient Conveyor
|10/09/2016||HERE YA GO BOIS||1||No|
Without using the duplication bug, the maximum amount of Ancient Conveyors you can obtain (assuming if you redeemed all five limited-time codes) is 55.