They are hard to transport to other areas once installed.

An energy weapon would only need to be installed once.

Very often these are things they installed once and then forgot about, haven't even used since.

Once installed as an executive at the store, the son remained until his death in 1933.

Once installed, Chris says the machine could not be more simple to use.

Once installed as a double agent, he was paid about £80,000 a year, or $128,000, the paper reported.

Once installed, hydroelectric power systems should run for many years.

Once installed, the $13 program (available at pocketmac.net) offers several options.

Once installed with the correct settings you can be talking to other computers within minutes.

And very often these are things that are installed once.