![Wolferos on Twitter: "Hearts of Iron IV: The Great War - Preview of the German Empire Air Tech Tree #hoi4 @HOI_Game #WW1 @PdxInteractive https://t.co/7wZNYNzFTG" / Twitter Wolferos on Twitter: "Hearts of Iron IV: The Great War - Preview of the German Empire Air Tech Tree #hoi4 @HOI_Game #WW1 @PdxInteractive https://t.co/7wZNYNzFTG" / Twitter](https://pbs.twimg.com/media/CoikByUVIAQdsQX.jpg)
Wolferos on Twitter: "Hearts of Iron IV: The Great War - Preview of the German Empire Air Tech Tree #hoi4 @HOI_Game #WW1 @PdxInteractive https://t.co/7wZNYNzFTG" / Twitter
![WIP] Preview of the German Empire Tank Tech Tree image - Hearts of Iron IV: The Great War mod for Hearts of Iron IV - Mod DB WIP] Preview of the German Empire Tank Tech Tree image - Hearts of Iron IV: The Great War mod for Hearts of Iron IV - Mod DB](https://media.moddb.com/cache/images/mods/1/31/30113/thumb_620x2000/tanks_tech_tree_german_empire.jpg)
WIP] Preview of the German Empire Tank Tech Tree image - Hearts of Iron IV: The Great War mod for Hearts of Iron IV - Mod DB
![Tank tech tree for eastern minor countries image - Hearts of Iron IV: Economic Crisis mod for Hearts of Iron IV - Mod DB Tank tech tree for eastern minor countries image - Hearts of Iron IV: Economic Crisis mod for Hearts of Iron IV - Mod DB](https://media.moddb.com/images/mods/1/33/32452/hoi4_2017-09-18_19-51-17-582.jpg)
Tank tech tree for eastern minor countries image - Hearts of Iron IV: Economic Crisis mod for Hearts of Iron IV - Mod DB
![Hearts of Iron on Twitter: "If you're someone who likes to play until well after the conventional end date, then the 'Ultimate Tech Tree' mod might be for you – it extends Hearts of Iron on Twitter: "If you're someone who likes to play until well after the conventional end date, then the 'Ultimate Tech Tree' mod might be for you – it extends](https://pbs.twimg.com/media/EPDu4ifXUAAhYUv.jpg)