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- Helicopter (20080 bytes)
1: ...b>fixed-wing aircraft</b>. The word helicopter is derived from the [[Greek language|Greek]] words ''he...
3: ...] Company (USA) [[Robinson R44|R44]], a four seat development of the [[Robinson R22|R22]].]]
5: ...ject only to refuelling facilities and load/altitude limitations, a helicopter can travel to any locat...
9: ...ransportation, casualty evacuation (including [[MEDEVAC]], and [[search and rescue|air/sea/mountain re...
13: ...ry AD]] book in China that described some of the ideas in a rotary wing aircraft. - Diving Glossary (6254 bytes)
4: ... keep track of the students, watch the gear, provide assistance when required.
5: ...hout stops, in a pattern resembling a spike, in order to retrieve items or due to poor [[buoyancy]] co...
8: ; [[Carbon monoxide poisoning]] : usually due to compressor maintenan...
9: ...: is due to incomplete elimination of carbon dioxide
11: ... the body causing symptoms ranging from rashes to death. - Stone Age (17593 bytes)
2: ...ehistoric]] time period during which [[human]]s widely used [[Rock (geology)|stone]] for toolmaking.
4: ...ll|shell]], [[antler]] and other materials were widely used, too. During the most recent part of the p...
6: ...he traditional start of [[history]] (i.e., [[recorded history]]).
8: ...[[archaeological culture|culture]]) to another, indeed, humanity continued to expand into new areas ev...
11: ...stone age' until they encountered technologically developed cultures. However, in general, it is belie... - Bicycle (44267 bytes)
5: ...ver one billion in the world today, bicycles provide the principal means of transportation in many reg...
7: The bicycle has impacted history considerably in both the cultural and industrial realms. ...
13: ...never existed, but were made up by [[Louis Baudry de Saunier]], a 19th century French bicycle historia...
14: ...|280px|Smartly dressed couple seated on an 1886-model bicycle for two.]]
15: ...drive mechanism, in [[1840]], which enabled the rider to lift his feet off the ground while driving th... - Motorcycle (40437 bytes)
7: ...o steer the motorcycle, in conjunction with the rider shifting their weight through their feet, which ...
9: ...ped with floorboards instead of footpegs, and [[sidecar]]s and other three-wheeled variations, commonl...
13: The world's first motorcycle, designed and built by [[Germany|German]] inventors [...
15: ...late 60's and early 70's who were able to produce designs faster and cheaper.
23: ...ear suspension being an integral component in the design.
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