Welcome to the 1520 Perfect Dictionary
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| Differential screw | |
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| DIFFERENTIAL SCREW Definition: A screw having two threads of unequal pitch, so that when the screw is turned thee threads have a relative motion. ____________________________________ See perfect type (1). See perfect screw (1). See perfect design (1). | |
1520 Products |
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1520 Products was established in 2005 with the purpose of entertaining and teaching us on key and important aspects of life (such as marriage, sex, etc) through the playing of games which will allow us to laugh but at the same time pass a message of what is the right or ideal way. |
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 1520 Sex Game |
 1520 Puzzles |
 1520 Marriage Game |