OT: how big would it be?

Nothing except that I thought they were a more recent innovation. I was thinking along the lines of, this is how you might build it with technology available in 19XX Can anyone give a timeline with (a) the invention and (b) the first commercial availability of: PCBs, Transistors, ICs (perhaps divide up by technology and scale of integration), and possibly other items of technology relevant to this period (say, 1940 to 1970)? Along similar lines, what multipin plugs were available at what date? In the 1930s and 40s, multipin plug and socket often meant something that plugged into a valve (tube) base... Philip. This E-mail message is private and confidential and should only be read by those to whom it is addressed. If you are not the intended recipient, you are hereby notified that any dissemination, distribution, copying, reproduction, modification or publication of this communication is strictly prohibited. Please delete the message from your computer and destroy any copies. This message is not intended to be relied upon by any person without subsequent written confirmation of its contents. This company therefore disclaims all responsibility and accepts no liability of any kind which may arise from any person acting, or refraining from acting, upon the contents of the message without having had subsequent written confirmation. If you have received this communication in error, or if any problems occur in transmission please notify us immediately by telephone on +44 (0)2476 425474