Heli Comparator
I don't think it was EC or their forebears Aerospatiale who pioneered the icing clearance. While Sikorsky may not have "invented" the icing clearance (and wouldn't claim to have done), the S61N had some sort of icing clearance before the 332L was in service.
I believe it could legally depart in "forecast light icing" conditions which in practical terms meant it could fly in light icing.......and did...very well.