Was just wondering why you were bringing up Chinese mags on GPA drivers on speakers that are 60 years apart. That's all OG ? Just trying to stick to the topic, this Northern Electric 604.IMO I think that NE would have received everything they needed from Altec even adhesives.It most likely would have been part of the licensing agreement.If they used inferior products it could have had an impact on Altecs reputation.As Altecs name is still on the label. Could they have used other stuff ? Anything is possible.