This December 1971 photograph shows the internal configuration of Skylab's Multiple Docking Adapter (MDA) flight article (forward view) as it appeared during the crew compartment and function review at the Martin-Marietta Corporation's Space Center Facility in Denver, Colorado. Designed and manufactured by the Marshall Space Flight Center, the MDA housed a number of experiment control and stowage units as well as providing a docking port for the Apollo Command module.

Workmen at the Martin Marietta Corporation's Space Center facility in Denver, Colorado, lower the Skylab Multiple Docking Adapter (MDA) flight article into the horizontal rotation fixture in preparation for the crew compartment and function review. Designed and manufactured by the Marshall Space Flight Center and outfitted by Martin Marietta, the MDA housed a number of experiment control and stowage units and provided a docking port for the Apollo Command Module.

This September 1972 photograph shows the internal configuration of Skylab's Multiple Docking Adapter (MDA) flight article as it appeared during the Crew Compartment and Function Review at the Martin-Marietta Corporation's Space Center facility in Denver, Colorado. Designed and manufactured by the Marshall Space Flight Center, the MDA housed a number of experiment control and stowage units and provided a docking port for the Apollo Command Module.

This September 1972 photograph shows the internal configuration of Skylab's Multiple Docking Adapter (MDA) flight article as it appeared during the Crew Compartment and Function Review at the Martin-Marietta Corporation's Space Center facility in Denver, Colorado. Designed and manufactured by the Marshall Space Flight Center, the MDA housed a number of experiment control and stowage units and provided a docking port for the Apollo Command Module.

This December 1971 photograph shows the internal configuration of Skylab's Multiple Docking Adapter (MDA) as it appeared during the Crew Compartment and Function Review at the Martin-Marietta Corporation's Space Center facility in Denver, Colorado. At left is the control and display console for the Apollo Telescope Mount. Designed and manufactured by the Marshall Space Flight Center, the MDA housed a number of experiment control and stowage units and provided a docking port for the Apollo Command Module.