Simple English definitions for legal terms
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Rule of operation: A way to use a machine to make it do what it's supposed to do. It's like a set of instructions that tell the machine how to work. This is what makes a machine different from just a regular thing you can buy. Machines have moving parts and a rule of operation that makes them useful.
A rule of operation is a method of using a machine to produce its intended useful result. It is what distinguishes a machine from an article of manufacture.
These examples illustrate how a machine is used to produce a specific result by following a set of steps or rules. Without these rules of operation, the machine would not be able to perform its intended function.