Mischna
Mischna

Kommentar zu Oholot 2:6

הַשִּׁדְרָה וְהַגֻּלְגֹּלֶת מִשְּׁנֵי מֵתִים, וּרְבִיעִית דָּם מִשְּׁנֵי מֵתִים, וְרֹבַע עֲצָמוֹת מִשְּׁנֵי מֵתִים, וְאֵבָר מִן הַמֵּת מִשְּׁנֵי מֵתִים, וְאֵבָר מִן הַחַי מִשְּׁנֵי אֲנָשִׁים, רַבִּי עֲקִיבָא מְטַמֵּא, וַחֲכָמִים מְטַהֲרִין:

[In Bezug auf] die Wirbelsäule oder den Schädel von zwei Leichen oder eine Revi'it von Blut von zwei Leichen oder eine Rova von Knochen von zwei Leichen oder Gliedmaßen von zwei Leichen oder Gliedmaßen von zwei lebenden Menschen, erklärt Rabbi Akiva [ dass diese andere unrein machen, und die Weisen erklären, dass es sie rein hält.

Bartenura on Mishnah Oholot

השדרה והגולגולת משני מתים – half of the vertebrae of the spine from this corpse and half of the vertebrae of the spine from another corpse, the skull.
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English Explanation of Mishnah Oholot

A backbone or a skull [made up from the bones] of two corpses,
A quarter [of a log] of blood from two corpses,
A quarter [of a kav] of bones from two corpses,
A limb of a corpse from two corpses,
And a limb [severed] from a living person, [such a limb being made up] from two persons,
Rabbi Akiva declares [the all] unclean
But the sages declare them clean.

In mishnah two we learned that Rabbi Akiva holds that a quarter of a log of blood mixed from two corpses is impure, even though there is not the requisite amount of blood from one corpse.
In all of these cases we have the amount of corpse stuff required to transmit impurity, but it is composed (or should I say, decomposed) of material from two different corpses. To be honest, I don't know how one puts together a limb that comes from two different people, whether it has to be attached or not. It seems like the two limbs are placed together such that they look as if they are attached.
Rabbi Akiva says that in all of these case, the limb, blood or bones defiles in the same way that a limb, blood or bones from one corpse does by contact, carriage and overshadowing.
The other rabbis say that these things are clean. What this means is that they do not defile through overshadowing. However, they do defile through contact and carriage, for even a bone the size of a barley-corn defiles in these manners.
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Bartenura on Mishnah Oholot

ואבר מן החי משני אנשים – half of a limb that is torn off from this living person and half of a limb that is torn off rom another living person, and they appear as one limb.
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Bartenura on Mishnah Oholot

וחכמים מטהרין -from defilement by overshadowing in a tent. But they defile through contact and carrying because of a bone the size of a barleycorn. And the Halakha is according to the Sages.
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