Questão jurídica principal
Whether the revision of the half invalidity pension under Article 17 ATSG was justified by a relevant change in circumstances.
Decisão extraída
Yes. The court held that both economic and medical circumstances had materially changed, so revision was justified.
Fundamentação extraída
The insured lost his former job and several earlier diagnoses could no longer be confirmed, while new arthrotic findings appeared. This constituted a legally relevant change, not merely a new assessment of the same facts.