Seen on /r/retrofuturism just now:

World-wide television programs will be the staple of the day. Reason: present television programs originating in other ciites are carried to your local station through expensive co-axial cables. T-cables, very thin and inexpensive, will take the place of co-axial cables and will link continents and cities.

My first thought was that "T-cable" refers to Twisted-pair cables, which are the main alternative to coax cables - but twisted-pair cables date back to 1881, making them just as ancient as coax was by the 1950s when this comic-book page was published; I wasn't able to find any relevant alternatives with with medium-effort Google searches for variations on "t-cable" either (and Tri-axial cable can't possibly be any less expensive than coaxial).

From a 1951 comic book, as seen on /r/retrofuturism just now:

World-wide television programs will be the staple of the day. Reason: present television programs originating in other ciites are carried to your local station through expensive co-axial cables. T-cables, very thin and inexpensive, will take the place of co-axial cables and will link continents and cities.

My first thought was that "T-cable" refers to Twisted-pair cables, which are the main alternative to coax cables - but twisted-pair cables date back to 1881, making them just as ancient as coax was by the 1950s when this comic-book page was published; I wasn't able to find any relevant alternatives with with medium-effort Google searches for variations on "t-cable" either (and Tri-axial cable can't possibly be any less expensive than coaxial).