Core Memory Unit 8K x 18 bit

Electronic Memories
Military Products
Core Memory Unit
8k x 18 Bit
PN: 926243-A09
Rev: B
Ser No: 10007
D/C: 7522
Des Act/Mfr: 16224
C/N:
────────────────
EMM
Assy 930977-A08
Rev M
Serial No
200055
930978-001 Rev J
────────────────
Electronic Memories Inc
Inspection Seal
by MC-14
6/11/74

An explanation of its operation can be found in this Wikipedia core store article .
Core memory is non-volatile storage—it can retain its contents indefinitely without power. It is also relatively unaffected by EMP and radiation. These were important advantages for military platforms. However, at present we do not know what this Circuit Module was used on.
D/C 7522 DES ACT/MFR: 16224
On Rear: Assy 930977-A08 Rev M Serial No. 200055 930978 Rev J