13019. Invention

Invention : boomerang
Year : c. 15,000 years ago
Inventor : aboriginal peoples
Country : australia.

13020. Invention

Invention : braille system
Year : 1824
Inventor : louis braille
Country : france.

13021. Invention

Invention : brassiere (bra)
Year : 1913
Inventor : mary phelps jacob
Country : us.

13022. Invention

Invention : bread, sliced (bread-slicing machine)
Year : 1928
Inventor : otto frederick rohwedder
Country : us.

13023. Invention

Invention : button
Year : c. 700 bc
Inventor : greeks, etruscans
Country : greece, italy.

13024. Invention

Invention : buttonhole
Year : 13th century
Inventor : -
Country : europe.

13025. Invention

Invention : calculator, electronic hand-held
Year : 1967
Inventor : jack s. kilby
Country : us.

13026. Invention

Invention : calculus
Year : 1680s
Inventor : sir isaac newton and gottfried wilhelm leibniz (invented separately)
Country : england and germany (respectively).

13027. Invention

Invention : calendar, modern (gregorian)
Year : 1582
Inventor : pope gregory xiii
Country : italy.

13028. Invention

Invention : camcorder
Year : 1982
Inventor : sony corp.
Country : japan.

13029. Invention

Invention : camera, motion picture
Year : 1891
Inventor : thomas alva edison, william k.l. dickson
Country : us.

13030. Invention

Invention : camera, portable photographic
Year : 1888
Inventor : george eastman
Country : us.

13031. Invention

Invention : can, metal beverage
Year : 1933
Inventor : american can co.
Country : us.

13032. Invention

Invention : can opener
Year : 1858
Inventor : ezra j. warner
Country : us.

13033. Invention

Invention : candle
Year : c. 3000 bc
Inventor : -
Country : egypt, crete.

13034. Invention

Invention : canning, food
Year : 1809
Inventor : nicolas appert
Country : france.

13035. Invention

Invention : carbon-14 dating
Year : 1946
Inventor : willard f. libby
Country : us.

13036. Invention

Invention : cardboard, corrugated
Year : 1871
Inventor : albert jones
Country : us.

13037. Invention

Invention : cards, playing
Year : c. 10th century
Inventor : -
Country : china.

13038. Invention

Invention : cash register
Year : 1879
Inventor : james ritty
Country : us.

Fact
Balance of trade
The difference between the value of imports and exports. It is favourable when the value of exported goods exceeds the value of imported goods. If it is reverse balance is unfavourable.      .. More >>