Abstract: A grinding wheel includes a plurality of wheel tips. The plurality of wheel tips include a plurality of diamond abrasive grains and a bonding material mixed with the diamond abrasive grains. The plurality of diamond abrasive grains have a ratio of a length in a long axis direction to a width in a short axis direction of 1:2.5 to 1:3.5 and includes edges or vertices having a grinding angle of 90° or less.

Abstract: A device for inhibiting an increase in temperature in a gas cooker including a cooker body, a combustion chamber defined in the cooker body and provided with an upper burner and a lower burner both constituting a grille, a manipulation unit disposed at a front portion of the cooker body, and a flue communicated with the combustion chamber, the device comprising a plurality of air intake ports provided between the grille and the manipulation unit, an air passage communicated at one end thereof with the air intake ports and at the other end thereof with the duct, the air passage being disposed above the combustion chamber, an insulating member disposed between the air passage and the combustion chamber, and an exhaust port communicated with an outlet of the combustion chamber and the duct, whereby a natural convection type cooling construction utilizing a heat generated by a combustion carried out in the combustion chamber is obtained.