Reference for Kelim 12:2
קְנֵה מֹאזְנַיִם שֶׁל סָרוֹקוֹת, טָמֵא, מִפְּנֵי אֻנְקְלָיוֹת. וְשֶׁל בַּעֲלֵי בָתִּים, אִם יֶשׁ בּוֹ אֻנְקְלָיוֹת, טָמֵא. אֻנְקְלִין שֶׁל כַּתָּפִין, טְהוֹרָה. וְשֶׁל רוֹכְלִים, טְמֵאָה. רַבִּי יְהוּדָה אוֹמֵר, שֶׁל רוֹכְלִים, שֶׁלְּפָנָיו טְמֵאָה, וְשֶׁלְּאַחֲרָיו טְהוֹרָה. אֻנְקְלִי דַרְגָּשׁ, טְמֵאָה. וְשֶׁל נַקְלִיטִין, טְהוֹרָה. שֶׁל שִׁדָּה, טְמֵאָה. וְשֶׁל אָקוֹן, טְהוֹרָה. שֶׁל שֻׁלְחָן, טָמֵא. שֶׁל מְנוֹרַת הָעֵץ, טָהוֹר. זֶה הַכְּלָל, כָּל הַמְחֻבָּר לַטָּמֵא, טָמֵא. וְהַמְחֻבָּר לַטָּהוֹר, טָהוֹר. וְכֻלָּן, אַחַת אַחַת בִּפְנֵי עַצְמָן, טְהוֹרוֹת:
If one purchases the scales of wool-dealers, they are subject to impurity, because of the hooks. Of householders, if they have hooks, they are impure. Carriers' hooks are pure. Of merchants, impure. Rabbi Yehudah says, [hooks] of merchants, what is before him is impure, and what is behind him is pure. The hooks of a footstool are impure. Of poles on a bedstead, pure. Of a strongbox, pure. Of a reed-basket, pure. Of a table, impure. Of a wooden lamp, pure. This is the rule: All [hooks] that are attached to something subject to impurity are also subject to impurity. All [hooks] that are attached to something not subject to impurity are also not subject to impurity. All [hooks] that are [detached so that] each one is by itself, are pure.