Assorted PCB ID?

I found myself cleaning up the shop recently, and came across some vintage circuit boards I had stashed away 20 years ago. I?m curious if anyone can shed some light on what systems they originally went to. Here?s a link to the album?more info below. https://photos.app.goo.gl/amRmm5P8375js4o1A <https://photos.app.goo.gl/amRmm5P8375js4o1A> #1 Marked Aeronutronic Address Buffer D700909. Socketed transistors and test points along leading edge with ID tab visible when installed. #2 No name or brand marking, sides have cast aluminum rails and a clever locking mechanism. Transistors are 2N-167 in clips. #3 Marked 'Power Supply 1534 8253' 5-1-70, single-sided with edge connector. #4 Large card 11?x10?, Burroughs logo. Date stamp of Jun 1972. Not sure if someone has robbed some of the ICs or if this was optional population. #5 Small 3x4 card, single-sided but every hole has an unusual pressed-in and flow-soldered barrel. Relays are marked Blue Bead 26.5V. Looks early Japanese. 4 corner brackets have threads swaged-in for mounting. Thanks, Cory