Williams Patent Crusher is proud to offer a line of rock crushing machines that provide a wide range of available options. We understand that every crushing and grinding job is different, and we strive to make sure every machine we construct is a custom solution that gets a specific job done right. WORKING ON THE FARM. The unit that they purchased was a rock crusher designed for skid steers, MB-L160 crusher bucket. While Michael had his initial concerns, primarily with how well the crushers can process the rocks, he found himself impressed with the results once they started using the crusher.