"Unknown"@en . . "1927"^^ . "Jan Mattern"@en . "150"^^ . "Center"@en . . . . . "Jan Mattern (birth and death records unavailable) was a Czechoslovak ice hockey player."@en . "Jan Mattern (birth and death records unavailable) was a Czechoslovak ice hockey player."@en . "1938"^^ . "Jan Mattern"@en . "24"^^ . "Unknown"@en . .