I discussed it with my cyber friend at this link: http://www.coolder.com/iblog/?p=2429

I also get a response from linkedin.com as below.

LinkedIn Groups
Group: LinkedPHPers – The Largest PHP Group
Discussion: Please tell me what they are and what they are for? (images)
No. 1 – are ribbon cable connectors
No. 2 – I have no idea
No. 3 – are variable resistors or potentiometers  
No. 4 – capacitors, as you guessed
No. 5 – appear to be 25-pin, D-sub connectors for ribbon cable
No. 6 – a rolled-up length of ribbon cable

HTH,
Ken

Posted by Ken Winans

Tks, gentlemen. 🙂