https://youtu.be/fiLs5jnLMCw
Feb
20
Feb
20
https://youtu.be/ziDoZ1N0UGM
Feb
20
https://youtu.be/cUPihXHRggY
Feb
20
https://m.youtube.com/watch?v=Gr7D4Bk_t9o
Feb
20
https://m.youtube.com/watch?v=KkTopAcOqJI
Feb
20
https://youtu.be/A81nvDdP5KY
Feb
20
1872- Cyrus Baldwin patents the Hydraulic electric elevator
Feb
19
https://youtu.be/Ln7qw6i-FAI
Feb
19
https://youtu.be/3s7EauUYH9w
Feb
19
https://youtu.be/okIB65YlwaM