i think the first is a diode, an old type of, or it might be small soil..try mesure its resistance.....
about the second, i dont know what it is....i also bought an old ISDN controller and it has 2 things that loog just like it, i searched the net, but couldnt find anything about it.....
the third i'm sure it is a transformer, old modems uesd thme for insulation, most like a telephone uses them, new ones have other type of separation methods and protection....
ill search the net and c what i can find.....