List of companies founded in 1920?

Afrikaanse Hoër Meisieskool Pretoria is the oldest Afrikaans girls high school in the country. The school will turn 100 on the 28 January 2020. We are trying to find companies in South Africa that share the same ‘age’ as Meisies Hoër. Would anyone from the heritage community be able to assist us in compiling a list?

Colleen Naude - colleen.naude@ahmp.co.za