What is the grammatical structure of: 我把你们带到茶馆来。 I was reading New Practical Chinese Reader Chpater 27 and stumbled upon the following sentence: 我把你们带到茶馆来。  While the meaning of the sentence is pretty clear, I have trouble understanding its underlying structure and hope someone can help me.

Thus far I figured out: You use 把 together with 带到 that something has been moved from one to place to another. In this case: The place of 你们 to 茶馆。

However, what is the idea behind 来 ？

Google translate provides the following translation for the two sentences:

我把你们带到茶馆来。I will bring you to the tea house.

我把你们带到茶馆。I will take you to the tea house.

Considering the context of these sentences however: The action all took place in the past. That's why I am a bit wary about Google Translate suggestion. 

Can someone explain what the underlying structure of the sentence is - what can be deduced / what cannot be deduced?
Here unfortunately, 来 doesn't indicate completion. Instead, it indicates direction of an action.
我把你们带到茶馆来=我把你们带来茶馆（indicating that the speaker's location is (or was, depending on context) 茶馆）
Comparison:
我把你们带到茶馆去=我把你们带去茶馆（indicating that the speaker is not at 茶馆）