Perry

D.Sc. D.Eng.

Burgerauerstrasse 29,

9470 Buchs (St. Gallen)

Switzerland

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Wong

Gärtli 3,

9475 Sevelen (St. Gallen)

Switzerland

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Sperry

Rosenbergstrasse 46,

9000 St. Gallen (St. Gallen)

Switzerland

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