Abstract: An apparatus which manually forces open shells during the downward stroke of a reciprocating plunger. Opening can occur through shearing of the two shell halves along their seam. The tip of the plunger can be a long inclined blade and wedge shaped. The apparatus may open all sizes of shells by applying a downward force on at least one of the shell halves. Alternatively, both shearing and sliding forces are applied. In one embodiment the shell is placed parallel to the angle of taper of the tip for opening. When the plunger comes down it exerts by frictional shearing force on the shell which causes the halves to slide off each other and open providing access to the inside.

Abstract: An oyster opening apparatus provides a rotary drum having an interior for holding unopened oysters. Projections or baffles on the drum interior lift and then drop the oysters, thereby loosening their shell parts. Removal of the edible part can then be completed manually using an oyster knife.

Abstract: An apparatus which automatically forces open shells during the downward stroke of a reciprocating plunger. Opening can occur through shearing of the two shell halves along their seam. The tip of the plunger can be a long inclined blade and wedge shaped. The apparatus may open all sizes of shells by applying a downward force on at least one of the shell halves. Alternatively, both shearing and sliding forces are applied. In one embodiment the shell is placed parallel to the angle of taper of the tip for opening. When the plunger comes down it exerts by frictional shearing force on the shell which causes the halves to slide off each other and open providing access to the inside.

Abstract: A ruler for drawing or measurement of circles, straight lines, and angles. The ruler body has a longitudinal slot in the middle and parallel with the length of the ruler. A sliding pen or pencil holder is placed within the slot for drawing or measuring. A compass is included in the combinations.

Abstract: A ruler for drawing or measurement of circles, straight lines, and angles. The ruler body has a longitudinal slot in the middle and parallel with the length of the ruler. A sliding pen or pencil holder is placed within the slot for drawing or measuring. A compass is included in the combinations.

Abstract: A ruler for draws or measurements of circle, straigth line, and angle. The line drawing or measuring is sliding belong in the ruler's track; which is at middle and parallel on the ruler's length. These techniques are combined for a simple ruler.