Little over a year ago, Cashels, a Mayo-based designer and manufacturer of farm and construction machinery, exited receivership. Now it is taking a patent infringement suit against a rival producer called Prodig Attachments that trades under the slogan “strength, design, innovation”. Prodig is a family run affair based in Bagenalstown, Carlow. Like Cashels, it specialises in construction and agricultural equipment, including the subject of the legal dispute, bale cutters.  Last October on Facebook, the firm unveiled a new bolt-on tractor attachment to speed up animal feeding; the ProDig ProSlice, a bale shear equipped with a “reliable 6 claw Plastic &…