Can you have multiple adwords coupons one account?

I dont use adwords, but i was on a flight couple weeks ago and the promo mags all contain a redeemable adwords coupon for 75 euros a piece. I doubt those are redeemable for an account that already used a coupon but i imagine if they were one could pick up quite a few on a flight to resell you could make a few bucks.

I didn't grab any because i didn't have a promo mag in my row, and I couldn't be bothered to grab from another row.