Elucidatio Sancti Bonaueture in Quartum Libru Sententiaru (1493)

Incunabulum spine repair

Before Treatment

Missing spine piece	Corner at head	Tail
Missing spine piece	Foreedge	Existing paper repair
Remaining torn spine covering	Exposed spine folds and supports	Open inner hinge

During Treatment

Stabilizing loose calf	Lining spine and supports	Removing previous paper repair
Building new tissue hollow	Adhering tissue in hinge

After Treatment

Stabilized spine	Corner at head	Tail
Stabilized spine	Foreedge	Edge of hollow tube
Tissue repairs and spine crossection	Lined spine	Tissue in hinge