Related על בבא בתרא 151:2

A ship is acquired with drawing (meshikhah). Rabbi Natan says: A ship and documents are acquired with drawing and with a contract. Which is drawing? Whether he drew [the animal], whether he drove [it], whether he called to it and it came after him—this is drawing. Which is handing over (mesirah)? Anyone who handed over to him the halter and he took it—this is handing over. In what cases did they say that moveable property is acquired with drawing? In the public road or in a courtyard which doesn't belong to either [party in the transaction]. On the property of the buyer, whenever he accepts it, he acquires. On the property of the seller, when he lifts it or until he takes it out of the owner's property. On the property of the one with whom he deposited [the animal], until he [the bailee] accepts it [the responsibility of looking after the item for the buyer] or until he [the buyer] rents the place [where the item is stored with the bailee].