DRIRU Manufacturer?

1. Twitter / NASAVoyager2: Initialize Dry Rotor Inertial ...
   
2. Inertial attitude control of Voyager spacecraft using dry tuned rotor gyro
   
1. DRIRU II - The NASA standard high performance Inertial Reference ...

Teledyne.....

How do you know?

According to this web site, http://arc.aiaa.org/doi/abs/10.2514/6.1982-1624, the DRIRU-I, manufactured by Singer-Kearfott, was used on Voyager. The DRIRU-II, made by Teledyne, was used on several other NASA spacecraft, including all the Multimission Modular Spacecraft: Solar Maximum Mission, Landsats 4 and 5, etc. The DRIRU-I was also known as the SKIRU, and its later developments stayed in production longer than the Teledyne unit (which many believed was superior). The SKIRU was used on the Tropical Rainfall Measuring Mission (TRMM) and the Rossi X-Ray Timing Explorer (RXTE). A less expensive Kearfott unit using a similar design, the Two-Axis Rate Assembly (TARA) was used on the Swift and Wilkinson Microwave Anisotropy Probe (WMAP) spacecraft.