Responsa for Shabbat 115:14
והא תניא כלי אבנים כלי גללים וכלי אדמה אין מקבלין טומאה לא מדברי תורה ולא מדברי סופרים אלא ש"מ של מתכת ש"מ:
one [a slave] may not go out with it; that about which the master is not particular, one may go out with it. Reason too supports this, since it is stated: 'none of these are susceptible to defilement'. Now, if you say [that the reference is to] metal [seals], it is well; [hence] only these are not susceptible to defilement, but their utensils<span class="x" onmousemove="('comment',' I.e., the general appointments of an animal, its accoutrement and equipment, which rank as utensils. ');"><sup>14</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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