At 06:23 AM 12/22/2005, you wrote:
Does anyone recognize this device or know what machine
it was used in?
SINGER MDL L107MA-17-2100, P/ N P56-050-110 MAGNETIC DISC MEMORY
http://cgi.govliquidation.com/auction/view?id=745204&convertTo=USD
The clue is "Librascope", this is the company that made the LGPs:
http://en.wikipedia.org/wiki/Librascope_LGP-30
- John