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Still open questions:
- when was this design popular? How often was it used? when did it get in disuse?
- are box germination designs with perforated floors still considered Saladin boxes or not?
- are boxes with electrically driven screws still Saladin boxes?
- are round vessels with rotating arms of screws still Saladin boxes?
Martijn Hoekstra (talk) 15:59, 21 January 2012 (UTC)