&gt; What is the printing technology? Typebar, daisy-wheel, dot-matrix?<p>Judging by the ribbon cartridge type and the spec of 20-22 characters per second I expect they&#x27;re daisywheel printers. Also if you look closely at the clear cased versions you can see the head assembly which has a daisywheel loaded<p><a href="http:&#x2F;&#x2F;www.swintec.com&#x2F;clear-typewriters&#x2F;21-2410cc-michigan.html" rel="nofollow">http:&#x2F;&#x2F;www.swintec.com&#x2F;clear-typewriters&#x2F;21-2410cc-michigan....</a><p><a href="http:&#x2F;&#x2F;www.swintec.com&#x2F;15-print-wheels" rel="nofollow">http:&#x2F;&#x2F;www.swintec.com&#x2F;15-print-wheels</a><p>&gt; What does the &quot;display&quot; provide, one line of type you can correct before printing?<p>If you have a read of the spec here:<p><a href="http:&#x2F;&#x2F;www.swintec.com&#x2F;48-2640-electronic-display-typewriter-.html" rel="nofollow">http:&#x2F;&#x2F;www.swintec.com&#x2F;48-2640-electronic-display-typewriter...</a><p><i>700-character Correction Memory ( within 10 lines)</i><p>You can do some basic correction. I used to maintain&#x2F;repair this kind of thing back in the late 80&#x27;s early 90&#x27;s when I worked as a field service engineer. Some more advanced units could store whole documents and do more clever things.