Eleanor, these frames are known as Taylor frames, they could be used both for algebra and numeric applications. I am unfamiliar with the algebraic representations but the numeric type, which were all basically lead, had a bar at one end and two lumps at the other. The holes were octagonal and numbers and minus, plus, multiply, divide, decimal point and equals were represented by the position of either the bar or lumps. The rest of the ends on each type were flat. I have one of these plastic frames and from my days having useable sight, remember the board was redish-brown and the tray and back white. I will see if a friend can photo mine, do you want with and without type, in the board and laying in the tray? I only have the numeric type. Colin Howard, living near Southampton in Southern England, draws your attention to the up-and-coming 2012 Olympics on the starting day of which is his birthday!! ** To leave the list, click on the immediately-following link:- ** [mailto:access-uk-request@xxxxxxxxxxxxx?subject=unsubscribe] ** If this link doesn't work then send a message to: ** access-uk-request@xxxxxxxxxxxxx ** and in the Subject line type ** unsubscribe ** For other list commands such as vacation mode, click on the ** immediately-following link:- ** [mailto:access-uk-request@xxxxxxxxxxxxx?subject=faq] ** or send a message, to ** access-uk-request@xxxxxxxxxxxxx with the Subject:- faq