Happy, Sewing Machine, models:

HCD	How To Install
HCD-1501	Operation And Maintenance
HCG Series	Instruction Book
HCH	Instruction Book
HCH Series	Manual
HCH-701	Quick Reference Manual
HCS	Instruction Book
HCS-1201-30	Maintenance Manual
HCS2-1201	Operation & Maintenance Manual
HCS2-1201-30	Maintenance Manual
HK634020XB	Maintenance Manual