A reader points out that there might be some confusion over a section of our June 10 article, "Crane Certification Primer." One of the items covers "grandfathering" of crane operators based on experience, incidence rates and/or training.The article states that grandfathering is not allowed, but crane operators with 1,000 hours of documented crane operating time to skip the practical examination for recertification."Based on my admittedly incomplete understanding of this," the reader
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