Conversation so far:
when did the ce mark become a requirement on new equipment
The CE Mark is defined as the European Union’s mandatory conformity marking for regulating the goods sold within the European Economic Area since 1985.
on what equipment did the ce mark become a requirement
The directives requiring CE marking affect the following product groups: active implantable medical devices (excluding surgical instruments), appliances burning gaseous fuels, cableway installations designed to carry persons, and many more.
where is the CE mark a requirement
CE marking is mandatory for certain product groups intended for sale within the European Economic Area, Turkey and (at least until the end of the Brexit transition period) the UK.

Question: what countries make up the area
Self-contained rewrite: what countries make up the european economic area