Assertion: available prosthesis | /r/HasProperty | introduced by singer
Facets:
value: in 1980
type: TEMPORAL
Source sentences:
text: In 1980, the first commercially available prosthesis was introduced by Singer and Blom: the ‘Blom-Singer® Duckbill’, a 16 French diameter, non-flanged device that the patient could remove, clean and replace him-