Kinyan Agav

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The Gemora (Bava Kamma 12) rules that the movable property does not need to be piled on the real property in order for the kinyan agav (by making a kinyan on the land, he automatically acquires the movable property) to be effective.

The Rishonim ask: If the halachah would be that kinyan agav is only effective if the movable property is piled on the land, why would it be necessary to use agav? The movable property should be acquired because it is resting in his courtyard!?

The Ritv”a answers: The Gemora is referring to a case where the courtyard is not protected and therefore it cannot be used to make a kinyan. That is why agav is necessary.

The Shitah Mekubetzes answers that a courtyard can acquire for a person only movable property that entered it after it became his. However, a courtyard cannot acquire property that was in it before the courtyard became his.

The Steipler Gaon writes that the Shach states this halachah only with respect to the acquisition of a courtyard without the knowledge of the owner. However, if he intends to use the courtyard to acquire the movable property which is found in it, it will be effective even if the property entered the courtyard before it became his.

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Mobile Courtyard

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The Gemora (Bava Kamma 12) states that a moving courtyard cannot effect an acquisition for its owner. The Rishonim disagree as to the reason for this. Rashi and Tosfos maintain that since the halacha that a courtyard can effect an acquisition for its owner is derived from the halacha of acquiring through one’s hand, a moving courtyard, which does not resemble to a hand (which is stationary), cannot effect an acquisition for its owner.

The Ritva and the Ran suggest a different reason for this. They say that since the courtyard can be a great distance away from the owner, it is not considered protected by the owner, and therefore it is disqualified from effecting an acquisition for the owner.

The Divrei Mishpat notes that the following case would be a difference between them: If a lost object would fall on his animal which is in his courtyard. If a mobile courtyard is excluded because it does not resemble a person’s physical hand, he will not acquire this lost object, for the animal is a moveable object. If, however, a mobile courtyard is disqualified from effecting an acquisition because it is not guarded from intrusion by the owner, here, he will acquire the lost object because the object is protected.

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