It's apparently from the 50s, as seen here: https://archive.org/details/sim_electronics-now_1959-03_30_3/mode/1up https://archive.org/details/sim_electronics-no

It's apparently from the 50s, as seen here: https://archive.org/details/sim_electronics-now_1959-03_30_3/mode/1up https://archive.org/details/sim_electronics-now_1959-03_30_3...