18 Nov
2010
18 Nov
'10
4:58 a.m.
Some kind of US Military Standard Electronic Module, see
http://www.tpub.com/content/MIL-SPEC/MIL-M/
(the marking M28787 is the MIL-M number)
Referred to here:
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.129.4343&rep=r…
No idea what they are/were used in.
If you Google for M28787 there are dozens of surplus supply outfits
selling these.
/Jonas