I t has now been well over half a century since the Boeing 747 entered service, with the type's introduction in the early 1970s marking a milestone in terms of 20th-century long-h ...

8 The excess was removed using a cotton roll and, when necessary, using a dental floss. Then, Icon resin was light cured for 40 s with BA Optima 10 lamp. Finally, the rough surface was polished using ...