ul li p8232019 Holophane PAL Mercury Brochure 1971p p14p li li p8232019 Holophane PAL Mercury Brochure 1971p p24p li li p8232019 Holophane PAL Mercury Brochure 1971p p34p li li p8232019 Holophane PAL Mercury Brochure 1971p p44p li ul