Originally Posted by
Antipodes
Can't tell you much about ATAX or Guidon Philippe, but they were common on French bikes of the period.
Both my Gitane bikes have Guidon engraved bars and I believe my PSV10 does too - but I's have to confirm that when I get home. There's your French bike theme.
Edit: One set of Franco Italia D352 bars and two of the Tour De France D357 models on the PSV and Gitane Tour de France bikes. They're all nicely engraved