SYSTEM, METHOD AND APPARATUS FOR FIBER CEMENT UNDERLAYMENT OR BACKERBOARD

A building sheet includes a substantially flat board having a front surface, a back surface and a thickness defined therebetween. At least one of the front and back surfaces defines a surface direction. The thickness defines a thickness direction that is substantially perpendicular to the surface direction. Recesses are formed in at least one of the front and back surfaces. The recesses have a maximum dimension in the surface direction of less than 3/8 inch, such that each recess is too small to receive a head of the fastener. 1. A building sheet , comprising:a substantially flat board having a front surface, a back surface and a thickness defined therebetween, at least one of the front and back surfaces defines a surface direction and the thickness defines a thickness direction that is substantially perpendicular to the surface direction; andrecesses formed in said at least one of the front and back surfaces, the recesses have a maximum dimension in the surface direction of less than ⅜ inch, such that each recess is too small to receive a head of a fastener.2. A building sheet according to claim 1 , wherein the recesses are discontinuous and spaced apart from each other by flats that extend in the surface direction.3. A building sheet according to claim 1 , wherein the recesses are configured to be crushed upon installation of fasteners therein claim 1 , such that heads of the fasteners are substantially flush with the board in the surface direction upon installation.4. A building sheet according to claim 1 , wherein the building sheet is a fiber cement product.5. A building sheet according to claim 1 , wherein the building sheet is a backer board or an underlayment claim 1 , and the thickness is about ¼ inch to about ½ inch.6. A building sheet according to claim 1 , wherein the recesses have three-dimensional shapes comprising pyramidal shapes claim 1 , semi-spherical shapes claim 1 , conical shapes claim 1 , or any combination thereof.7. A building sheet ...

Device for handling wire.

Dynamic mixer screw tip

An extruder screw tip (100, 101, 102, 103, 200, 201) has multiple extrudate mixing elements (134, 135, 234, 3134) on a mixing element ring (130a, 130b, 131, 230a, 230b, 3130); and the mixing element ring (130a, 130b, 131, 230a, 230b, 3130) is rotatable with the extruder screw tip (100, 101, 102, 103, 200, 201) to mix an extrudate at the end of a feedscrew (14) of an extruder machine (5).

Method, apparatus and machine-readable instructions for predicting a response to surgery

The present invention relates, in part, to methods of predicting a likelihood that a patient with a macular hole will respond positively to ophthalmic surgery, such as vitrectomy surgery. The methods include prediction of the level of vision achieved after vitrectomy for macular holes. The present invention also relates to machine-readable instructions and suitable apparatus configured to make 3D measurements for use in a method of predicting a likelihood that a patient with macular hole will respond positively to surgery.