[Boatanchors] Interesting Tubes: 6897, 2C40, 5786

[William]

Hello All,

Today's question:  Where were these used?

Today's follow up question:  Is there any demand for these?

Kids will be heading to college in a few years.  I wonder if I can plan on paying tuition with these or if they are worth only a short, chewed-up pencil with no eraser...

Thanks in advance for any helpful comments.

Best Regards,

William