Coins on tech cards with Investments expansion

By camillejr, in Sid Meier's Civilization: The Board Game

Hello everyone, I have a following inquiry: when you add a coin to the tech card (say, Code of Laws), where they are limited to max 4 coins, and then you invest a coin from this card, do you still have a limit of four coins, or now you can only have three more coins?

I know that a player must take this coin and get rid of it, but do you mark it somehow, that the tech card had once had a coin on it?

I would say no. The 4 coin limit is just that. A limit on how many coin tokens the tech in question may have on it at any given time. Otherwise the wording should've been "Limit four uses." or something to that effect.

True that, however it still seems like a game-breaker to me. Thanks for the reply :)