Where to find pictures of undersides of bricks? (possibly Lego clones about 25-30 yrs ago) I am trying to identify which non-Lego bricks I might have played in the past. Don't recall the names but I can probably recognize them from photos if I see them again

For example, I remember some 2x4 bricks having two horizontal lines across the center (on the underside).
Could it be BRIX BLOX?  Came across these on eBay and thought about you...