History: A "knocker-up" waking up clients (20th century) [600 × 775]

http://i.imgur.com/mA8zq37.jpg via /r/HistoryPorn https://www.reddit.com/r/HistoryPorn/comments/4xsjra/a_knockerup_waking_up_clients_20th_century_600_775/?utm_source=ifttt