Two-Way Records

What could this image possible convey? Using two styli at the same time on the same record? No, that was only fanciful and metaphorical.

Let's let this website explain:

When stereo was introduced, Design tried to claim that their records were compatible mono/stereo, and could be played on either mono or stereo players. The public soon found out that mono players would damage these records just as easily as other stereo records, so after reissuing or simultaneously issuing about 50 of their albums on a new series (the DCF-1000 Series), they abandoned the compatible stereo series in favor of the normal mono and stereo issues. The good part was, that for folks with stereo players, these records worked fine and were in true stereo, as far as we have heard. The bad side is that by the time the series was winding down, about 1960, the quality of the vinyl had deteriorated to the extent that right out of the wrapper the records were noisy.

So: another technology too good to be true, for which early adopters paid the price.