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Christopher Dunn's 1998 Bear & Company work — the principal engineering-focused alternative-Egyptology engagement with the Great Pyramid. Dunn, a master craftsman and aerospace manufacturing engineer, argues that specific machining marks visible on Egyptian granite artifacts (the substantial Serapeum granite boxes at Saqqara; specific drilling and sawing marks on Old Kingdom granite) require explanations beyond the documented tool capability of dynastic Egypt. The work has remained substantively contested in mainstream Egyptology; Dunn's specific engineering observations are the principal data the alternative-archaeology tradition cites.