HP LaserJet 4240 (Q7784A)
MFG Part Number: Q7784A
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Printer Support Linksshow
Duplexer parts for Q7784A HP LaserJet 4240 Printer
Q2439B
Duplexer - Automatic duplexer assembly - For LaserJet 4200/4250 and 4300/4350 series printers
LaserJet 4240 Printer parts list