On page 26 of the rulebook it says
Coin tokens placed on a tech card as a reward for accomplishing a certain task are treated just like coins on the map, except that there is a maximum number of times a given task will provide a coin token. Coin tokens advance the economy dial when gained and cannot be lost
Since there are ways to remove a coin token from a tech, how is the maximum number on the tech card interpreted?
a) The maximum number on the card means the maximum number of times that you may use this ability.
b) The maximum number on the card means the maximum number of coins that can be placed on the card using this ability.
The pottery tech card reads
max 4. Player A uses this four times (on four different rounds) and gets four coin tokens on it. Player B plays a culture card which enables him to discard a coin token on a technology card, and discards one of the coin tokens from the player A's Pottery card.
Can player A use the ability on the Pottery card fifth time to get a fourth coin token on the tech card?