| http://www.w3.org/ns/prov#value | - e closed by a cap or head, as shown particularly in Fig. 5, which caps or heads are each provided with two apertures, as shown in said figure, the aperture a being for the reception of the key K, (shown in Fig. 6,) for the purpose of furnishing means for rotating the cross-bar and removing it i'rorn the spool, and the other apertures being for the reception of a rod passing lengthwise through the
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