Unknown artists & comic series, can you help please?

[Nick_the_Greek]

Hi,
I can't find info for several comic series (& artists) reprinted in Greece, during the late '70s.
Can you help me identify them, please.

Samples

Title in Greek edition: The Boy with the Slingshot.

Title: The Saboteur.

Title: The Black Arrow.

Thanks in advance, any help would be very much appreciated.

[Nick_the_Greek]

I have already found one of them three.
The Saboteur (Greek: Ο Σαμποτέρ) is actually 'Hunter's War' series, from 'The Wizard'.
Two remaining...