The key chain or key ring, was invented in Oregon in 1922 by G. Herluf Johnson. Key chains come in a huge assortment of different designs and almost everyone own at least one or two.
The Kobotan keychain is a self defense mechanism that was invented by Takayuki Kobota. It is meant to be used in close combat not when fighting with arms at full stretch.
Frederick J. Loudin invented the keychain because of theft and forgetfulness. In the 1800s, pickpockets ran rampant and people lost their keys easily, so he invented something to help people avoid both of these issues.
Type your answer here... he invented the key chain to put keys on it
keychain
Keychain - 2012 was released on: USA: 21 July 2012
Yes. The compound word is a combination representing the specific item, a keychain.
The keychain is on the seagull above the trash can. Jump to catch it after you go talk to the man, I think.
An anti theft device for cars. It disconnects your ignition with a keychain. Without the keychain in, you can't start the car at all.
The compass on a key-chain idea was invented many years ago. This invention is still used today by many people. Honestly, there is no "for sure" inventor of this, people just started doing it and this idea became more known.
OSX keeps passwords in a "keychain" accessed by an application called, you guessed it, "Keychain Access". The password you set up when you first create a user account is the default password that encrypts the data and opens the file initially. You can change it to something else, however should you forget the new Keychain password you may lose whatever is kept within that file. 

Theoretically, if you forget your keychain password, you can reset it to your user password. To do this, you go to your Utilities/Applications File and select "Keychain Access." Choose the Keychain First Aid utility and click "Repair." It will ask for your username and password, and will tell you if any problems are found. You can try to have it reset the password to your user password. That allows you to access your keychain but doesn't change any of the passwords or encryptions in it. Unfortunately, that doesn't always work if the keychain password is different from your user password. When it doesn't, the only thing you can do is start over by deleting the old and creating a new keychain.
One can purchase a keychain breathalyzer at Best Buy or online at Amazon. Some bars will even have them for sale. There are lots of online sites where one could choose to purchase the keychain. Please drink and drive responsibly!
CAUTION!!Misuse OF KEYCHAIN ACCESS can cause your computer to turn into a doorstop.Each user has at least one keychain.To create a new keychain, you open "Keychain Access."Press "Shift-Command-N" Give the keychain a name, and make a note about its use.To create a personal public key, press "Shift-Command-A." Give it a name and make a note about its use.Use caution when accessing Keychain Access. The keychains are required in order to use the computer.