Printed circuit board
||Embossed on the solder side at the bottom
||EC0 73-065 PCA 406 PCA 380
||Written on a piece of plastic attached to one of the circuits on the component side
||Stamped on the component side at the bottom
overall: 1/2 in x 6 1/2 in x 8 3/4 in
This object has approximately 55 circuuits. Most of them are stamped with the string "RAY" followed by an identification number.