On 1/13/18 9:04 AM, Jon Elson via cctalk wrote:

> I don't know what you are talking about with Mylar on both sides. They were 
> conventional magnetic tape, a clear mylar
> film with oxide applied to one side.

the actual spec is here:

http://bitsavers.org/pdf/dec/dectape/3M_DECtape_Spec_Nov66.pdf

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