cards are being referred to as slot card. as ie Slot card books. where all kinds of cards are described. if you list a card as a card or or any other nomenclature other than slot card. it will not be noticed on ebay or most every other venue. so they all come under the umbrella. as to the other question. yes I do have mechanics cards in my collection as do a few others. that is why most casinos mechanics now have them on cords attached to them selfs. I found mine earlier in my collecting none lately. last one I got did not have a employees ID on it. just plain like the regular cards. I saw the mechanic open the machine and went off and left it. I would be afraid to stick it into a machine.