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Instrument

  • US 5,596,143 A
  • Filed: 11/15/1995
  • Issued: 01/21/1997
  • Est. Priority Date: 12/09/1994
  • Status: Expired due to Fees
First Claim
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1. An instrument comprising:

  • a dial plate, anda transparent front cover covering the dial plate,wherein said front cover comprises;

    a toothed central portion having a plurality of continuous ditches extending horizontally for reducing reflection of light; and

    a smoothed fringe portion having a width wider than one of said ditches and being disposed generally perpendicularly to said ditchessaid smoothed fringe portion being connected to said toothed central portion in such a manner so that dust or dirt accumulated in said ditches can be wiped off by a piece of cloth toward said smoothed fringe portion.

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