Industrial equipment - AP A2514 R/EMD 1648/63 - United Kingdom - AP A2514 test equipment

A.P. A2514 is probably a part number or catalog reference for a military test device, referred to as a Test Set. The number R/EMD 1648/63 could refer to the specification, a contract number, or a manufacturing date of 1963.
Details
Equipment type: Test device (Test Set).
The markings 'A.P.' (Air Publication, a common type of British military publication) and the style of the plate suggest that it is likely British military or air force equipment from the mid-20th century.
Specific function: Without more context about the device itself (such as the type of receiver or transmitter being tested), the exact function cannot be determined. Military testing equipment includes various items such as oscillators, receivers, and more.
Cannot be tested because the auxiliary equipment required for this is not available.
As you can see in the photos, it is filled with beautiful components, including the metal box housing an HF test transmitter, which is highly sought after by radio amateurs because these products were used during the Cold War. The test transmitters needed to cover a broad spectrum, often from 50 kHz to 400-600 MHz.
Experiments with higher frequencies were indeed conducted, but not in this field; rather, they were in medical care.
He was a collector who has passed away; I don't know what he planned to do with it (keep or dismantle), but I've never come across this type before, so maybe someone else thinks, 'There he is, that's what I'm looking for.'