Old Electric Insulators (Deltas) 10, 20, 35 kV
 
This type Insulators used here on middle voltage from beginning of electric works until about 1980. Now unfortunately these type was changed for T-20 and TT-20 post Insulators. I saw in Italy 20 kV air-cable. Horrible!!
They were the general Insulators, the normal Delta ones with globe head with top groove or without it for medium voltage, 20 and 35 kV They are all UNIPART. The size and the color: white, brown are variable, exsists all versions.. R-20, R-35
The stronger Deltas for medium voltage. They are variable in all sizes and colors. The small one is for 10 kV, the largest one is for 35 kV. The 10 kV openwire lines were dead in Hungary, that small delta was manufactured to export. They are unipart also. ER-35, ER-20, ER-10
The Big Brothers, two 35 kV big Deltas, these are the biggest pin types in Hungary. They are unipart also.
The rarer unusual Deltas, the "wide shield" Delta, two part one and the very strong unipart Delta. The last is from Germany, here were this like Insuilators used also. Both is for 20 kV