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The clause of CSA Z256 that allows for the use of one counterweight on two rack and pinion driven material hoists is indeed 12.5. This provision addresses the specific conditions and safety measures that must be adhered to when utilizing a single counterweight for multiple hoisting units. It recognizes that in certain configurations, such as with two hoists operating in tandem, it is possible to optimize mechanical efficiency while maintaining safety requirements.

Clause 12.5 outlines the parameters under which this practice is acceptable, ensuring that the design does not compromise the stability or operational integrity of either hoisting system. This clause plays a crucial role in promoting safe lifting practices while providing flexibility in the design and operation of material hoists.