1872- Cyrus Baldwin patents the Hydraulic electric elevator
https://youtu.be/Ln7qw6i-FAI
https://youtu.be/3s7EauUYH9w
https://youtu.be/okIB65YlwaM
https://youtu.be/9mm9PWMEbmM
1967- Construction began on the Calgary Tower, a $3.5-million-dollar project in Alberta, Canada.
https://youtu.be/ITXvV-ADvMw
https://youtu.be/lJr_qw38X-c
https://m.youtube.com/watch?v=w2vMq8hjif4
https://youtu.be/t9tQ1-wCUBw