Abstract: A guitar sound hole guard comprising of a body of a suitable durable material to resist pick impacts and having a lip and at least one flange; the lip further having two side edges; each flange connects to a respective side edge to be oriented perpendicular to the lip and descending away from the lip, an open channel being formed by the lip and flange; an attachment means to hold the guard in place upon a soundboard of a guitar, wherein the body receives within its open channel at least a portion of a lower sound hole edge of the sound board allowing the lip to rest upon and conform concentrically to at least the portion of the lower sound hole edge.

Abstract: An iris retractor for use during eye surgery. The retractor comprises a substantially circular, resilient ring, the ring having an arcuate flange extending downwardly and outwardly therefrom, a plurality of transverse, reinforcing struts extending across the ring and the arcuate flange, and a pair of opposing pinions situated on the flange of the substantially circular, resilient ring. The retractor, prior to being placed within the pupil, may be contracted into a substantially oval configuration by means of suitable forceps engaging the opposing pinions, and, when placed within the pupil, may be expanded back into its circular configuration by means of the resiliency within the retractor.