Different Kind of Changable Core Lock

[spooky]

Changable Core Lock without side lug.

What do you call the changable core locks that do not have a side lug. Instead these have a single locking tab in the back of the lock that is operated by an extra lock pin.

I have one of these and can't find any information because I'm not sure what to call it.

[Squelchtone]

Changable Core Lock without side lug.

What do you call the changable core locks that do not have a side lug. Instead these have a single locking tab in the back of the lock that is operated by an extra lock pin.

I have one of these and can't find any information because I'm not sure what to call it.

Sounds like YALE Large Format Interchangeable Core

Do you have a brand or can you upload a photo? use this place: http://tinypic.com/

Thanks
Squelchtone

[Squelchtone]

This patent may be the kind or similar to what you have
http://www.google.com/patents/US3324693?printsec=drawing&dq=yale+control+key&ei=6nHoUKflL9CP0QGHw4HAAg#v=onepage&q=yale%20control%20key&f=false

Squelchtone

[averagejoe]

Could also be a Schlage LFIC. They use an extra pin.

[cledry]

They are still called interchangeable core locks.