unknown

I have this homemade 2x12 I bought some years back. Decided to crack it open to see what I was working with a noticed the speakers are Canadian made. Unfortunately that's all it says. The only information I can get from them is "DGD6", "Made In Canada" and I think it says "GL1250". Can anyone...

Does anybody know what or who these signatures belong to on the head? http://imgur. com/gallery/AX94n (remove space if the photo doesn't show)