lot of vintage old ceramic & glass lightning arresters/insulators

Lot of five assorted old and vintage porcelain and glass lightning arresters and insulators for radio antennas. There is:

a clear glass lightning arrester marked Knox that measures 3" long;

a brown pottery arrester that measures 2.5" long and has a small chip;

a cobalt blue lightning arrester marked Fedo (we think?). It measures 3" long.

There is also a pair of large porcelain egg shaped insulators that measure about 3" long and 2" square.