| 31. | The Proteus was a two spool, reverse-flow gas turbine.
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| 32. | The HP spool is similar to that of the BR710.
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| 33. | This allowed for quick spool and good low end tractibility.
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| 34. | These spools with silk and silver threads are further flattened for electroplating.
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| 35. | The take-up film spool is plain black with one slot.
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| 36. | It allowed each HASP system to share a common spool and checkpoint.
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| 37. | As well, many modern reels are designed to take interchangeable spools.
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| 38. | In 1975, a spool for welding rod was patented.
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| 39. | These medium format cameras used 120 film rolled onto spools.
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| 40. | Teams could hand over the spool for their next clue.
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