name/type of DC power connector? (Nikon D70, pic)

Hi,

I'm looking to make a portable battery pack (12V lead-gel battery and 9V step-down switching reg) to power a Nikon DSLR. The Nikon docs state that the 4-pin DC-in connector is an "industry standard DC connector". While it looks familiar somehow I couldn't find anything like it in those catalogs I glanced through.

So, would anyone here be kindly able to identify the connector shown here:

http://www.pitlane.nzsca.co.nz/eh-5_label.jpg

(actually it is a pic of the label of the EH-5 AC PSU, but shape and pinout of mystery connector is shown below the CE)

Many thanks!
- Jan
.