Responsa for Shabbat 115:19
וזוג דבהמה אין מקבלין טומאה ורמינהו זוג של בהמה טמאה
The Master said: 'An animal may not go out with a seal around its neck, with a seal on its covering, nor with a bell around its neck nor with a bell on its coat, and none of these are susceptible to defilement.' Now, does not an animal's bell contract uncleanness? But the following contradicts it: An animal's bell is unclean,<span class="x" onmousemove="('comment',' I.e., liable to uncleanness. ');"><sup>18</sup></span>
Teshuvot Maharam
Q. May a person attach a metal buckle to his girdle as an ornament, and then file the buckle into the shape of a key with which he can unlock the door of his house, and then wear this buckle on the Sabbath?
A. People do not usually wear metal keys on their girdles as ornaments. Therefore, this key is not considered an ornament and he is not permitted to wear it on the Sabbath.
SOURCES: Pr. 532; Mord. Shabb. 350; Hag. Maim. to Shabbat, 19, 4. Cf. Maharil, Responsa 84.
A. People do not usually wear metal keys on their girdles as ornaments. Therefore, this key is not considered an ornament and he is not permitted to wear it on the Sabbath.
SOURCES: Pr. 532; Mord. Shabb. 350; Hag. Maim. to Shabbat, 19, 4. Cf. Maharil, Responsa 84.
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