Turn, click. Open!
- There are many different types of keys which are used to open locks.
- Keys are tools that are used in security and access of homes and cars etc.
- House keys are the most common type of keys, then car keys.
- Keys can be double sided or four sided, for extra security.
- Thousands of years ago, wood was used to make keys.
- Some say that Theodore of Samos invented the key in the 6th century BC.
- Romans used to wear keys as rings as symbols of wealthiness and for security.
- Key duplicating was invented in 1917 using a blank key and a wheel that cuts the key.
- Some keys are cylindrical, and are called tubular keys, which are commonly used among vending machines, laptop and bicycle locks.
- Key cards are alternate keys that are like flat credit cards and are typically used in hotels.
Bibliography:
Key (Lock) 15 February 2013, Wikipedia, <http://en.wikipedia.org/wiki/Key_(lock)>
