I'm sorry to be bothering every one with my question,but I can't find any info on the web about this.I have Honey Tangerine (Murcott) on the Kinko (or Kinkol)rootstock.
What is kind of citrus a Kinko rootstock? Thank you! Viktor

It could be Kinkoji rootstock. It is a very cold hardy grapefruit type that is used as rootstock.

You will find the information under the spelling of its full name, which is Kinkoji.

Kinkoji Rootstock:

High pH = Intermediate
Clay Soil = Good
Wet Soil = Good
Drought = ?
Freezes = ?
Burrowing Nematodes = Susceptible
Citrus Nematodes ' Susceptible
Foot and Root Rot = Tolerant
Xyloporosis Viroid = Tolerant
Exocortis Viroid = Tolerant
Tristeza virus = Tolerant
Blight = ?
Tree size = Intermediate
Fruit yield/tree = Intermediate
Juice quality = Intermediate to Large
Fruit size = Intermediate

Millet (1,375-)

While Kinkoji is often used as a rootstock, its fruits are not bad for a grapefruit in places where only mandarins and cold hardier citruses can grow well.

JoeReal,Millet.Thanks you very much for the info.You found a mistake in my question and replay.Now I feel myself better. Viktor

http://www.citrusvariety.ucr.edu/citrus/kinkoji_unshiu.html

And I believe it is also called Bloomsweet grapefruit.