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- Timeline of invention (28171 bytes)
31: * [[Plough]]s in [[Mesopotamia]]
35: * 3500 BC: [[Plywood]] in [[History of ancient Egypt|Egypt]]
80: * [[600]]: Mouldboard [[plough]] in [[Eastern Europe]]
162: * [[1797]]: [[Cast iron plow]]: [[Charles Newbold]]
201: * [[1831]]: [[Multiple coil magnet]]: [[Joseph Henry]] - USS Monitor (7466 bytes)
19: |Displacement:||987 tons
29: |Complement:||59 officers and men
39: ...he brilliant but choleric Swedish engineer [[John Ericsson]], ''Monitor'' was described as a "cheesebox on a...
41: ...as a conventional wooden vessel covered with iron plates and bearing fixed weapons.
49: ...[river monitor]]s and deep-sea monitors, and they played key roles in Civil War battles on the Mississ... - Leif Ericson (4502 bytes)
4: ...dash; ''c.'' [[1020]]) was a [[Norsemen|Norse]] explorer, and the first [[Europe]]an known to have dis...
8: ...boat of [[Bjarni Herjólfsson]], and set out to explore the land that Bjarni had found, today known as...
12: ...and green grass year-round. They remained at this place over the winter. The sagas mention that one of...
16: Research done in the [[1950s]] and [[1960s]] by explorer [[Helge Ingstad]] and his wife, archaeologist...
29: ...ifericsson1.html A reconstructed portrait of Leif Ericsson] – Based on historical sources, in a contem... - Sweden (27111 bytes)
3: ...llegedly notorious [[Vikings]], Sweden spent a couple of centuries in battles with its neighbouring co...
67:
73: ...n's expansion into the northern wilderness of [[Laplandia]], the Scandinavian peninsula, and present-d...
84: ...ion]] in Sweden progressed during the century, people gradually began moving into the [[Cities of Swed...
87: ..., making it possible to expand its industry to supply the rebuilding of Europe, leading to Sweden bein... - Viking Age (10637 bytes)
2: ... Scandinavian warriors and traders, raided, and explored large parts of [[Europe]], the [[Middle East]...
6: ... to the [[Black Sea]] and then on to [[Constantinople]].
10: In 911, the French king, [[Charles the Simple]], was able to make an agreement with the viking...
17: ...rning the causes of the Viking invasions. For people living along the coast, it would seem natural to...
43: ...e rivers south to the [[Black Sea]], [[Constantinople]] and the [[Byzantine Empire]]. - Propeller (12179 bytes)
11: ...ater systems were automatic. Variable pitch was replaced with the constant speed mechanism. In some a...
17: ...irl. However on small aircraft the added cost, complexity, weight and noise of the system rarely make ...
19: ...]. Light aircraft sometimes forego the weight, complexity and cost of gearing but on larger aircraft a...
21: ...relative air speed at the blade is rotation speed plus axial speed, a propeller blade tip will reach s...
27: ...he damage. However the duct adds weight, cost, complexity and (to a certain degree) drag. - Mobile phone (30513 bytes)
10: ...Siemens AG|Siemens]], [[SK Teletech]], and [[Sony Ericsson]].
14: == Worldwide deployment ==
16: ... Due to their low establishment costs and rapid deployment, mobile phone networks have since spread ra...
18: ...lephone numbers in the [[North American Numbering Plan]] (NANP), and the lack of non-regional special ...
24: ...[clock]] and a [[calculator]] and often one can [[play]] some [[game]]s on them. Newer models sometim...
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