These documents were published by ESO (Electronics Supply Office) and have
2-page descriptions and often illustrations of every type of electronics test equipment used by the Navy. ESO also published similar Directories for
sonar, countermeasures, radiac, etc. equipment.
Part 94200.1 for Communications Equipment is here.
Notes on directory organization - equipment
is sorted into categories (frequency measuring, signal generating, etc.) but there is some
overlap - an oscilloscope might be in "Waveform Measuring Equipment"
or "Combination and Group Equipment". So use the index to see what categories to look in.
Alphabetical listings in the index and directory pages will put AN/USM-4, AN/USM-41, and AN/USM-411 before AN/USM-5. Equipment ABC-300 appears before AN/ABC-300 which appears before BC-300, which appears before 300, for example.
Unfortunately I am still missing some supplements - Please send e-mail if you can loan or sell me missing sections