I doubt that web page is from 1979, the page says they have been building dredges since 1979.
It may be an old page but it ain't that old!
Apple computers were not even on the market then, very few personal computers were available and the internet pages what few there were, rarely had pictures or color back grounds ( it took more memory than even most G'ment facilities had). Just black and white text was the norm.
BTW...the second link opened to an active site for me.