EMT 440 Electronic Pre-Delay System pair - very rare

Up for sale are two very rare EMT 440 Electronic Pre-Delay System racks, made in 1972. I’ve never seen these for sale before. The following modules are included:

Unit 1:
EMT 440N power supply 
EMT 440T stereo module
EMT 440E input module
EMT 440R 30ms delay module (4)

Unit 2:

EMT 440N power supply
EMT 440T stereo module
EMT 440E input module
EMT 440R 30ms delay module

All we know about them is that they are not been used for at least 30 years, so they probably needs service. We didn’t power them up. Sold as-is, as a project or for spares / parts.
Cosmetically they are in used, but fair condition for their age. One of the screws to lock a blank panel is missing. Please check the photos for an overall impression of the condition.

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