I have a set from the library from about 20 years back.  They are 
indeed heavy duty and work on either mono or stereo, but they are 
very heavy by today's standards and wear the ears out in fairly short 
order.  NLS may have lighter weight and more comfortable headsets out now.

73,

Dave, W7OQ

At 05:45 PM 6/18/2014, you wrote:
>Who is the manufacturer?
>
>
>Sent from my iPhone 5s!
>
> > On Jun 18, 2014, at 4:14 PM, Robert Ringwald <[log in to unmask]> wrote:
> >
> > If you get talking books and have a player from the Library of Congress, =
> > your library will give you a pair of earphones for your player. You then =
> > will need an adapter mini phone plug to standard quarter inch plug.=20
> >
> > I used to use my Bose earphones but I used them so much that sooner or =
> > later something would go wrong with them and it cost too much to replace =
> > them when they are out of warrantee.=20
> >
> > Most earphones I used to buy malfunctioned after a while because the =
> > cables are so thin and eventually short out.=20
> >
> > I like the ones from the Library as they are much tougher.=20
> >
> > -Bob Ringwald K6YBV
> >
> >
> >
> > From: Dave Basden=20
> > Sent: Wednesday, June 18, 2014 8:46 AM
> > To: [log in to unmask]
> > Subject: Headphones Recommendation Needed
> >
> > I'm in need of a new set of headphones and was wondering if anyone=20
> > has some he/she really likes.  They would be used with my Kenwood=20
> > TS-590.  I see the Kenwood HS-5 at HRO and will probably get hose if=20
> > no one has a suggestion for something I might like better.
> >
> > Dave, W7OQ