Some of these are so obsolete that even the awesome Frink [0] doesn't handle them

  From: 10 Wegstunde
  To: metres
  Result: Warning: undefined symbol "Wegstunde".
  Warning: undefined symbol "Wegstunde".
  Unconvertable expression:
  10 Wegstunde (undefined symbol) -> 1 m (length)

[0] https://frinklang.org/fsp/frink.fsp?fromVal=10+Wegstunde&toV...