The Tektronix 017-012 is a 50 Ω "Transformer-matched T" (power splitter) with GR-874 connectors on short coax pigtails. The rise time is specified to be less than 500  ps.

The 1964 catalog says:

This unit provides two 50-ohm outputs from one 50-ohm input
and divides the regenerated trigger for simultaneous triggering
of two sampling-sweep systems.

sold AS-IS.  Manual included.

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Sold AS-IS