Seems like they may have been the source of inspiration of VALVe for the Team Fortress 2 manuals: http://cdn.akamai.steamstatic.com/steam/apps/440/manuals/Sentr

Seems like they may have been the source of inspiration of VALVe for the Team Fortress 2 manuals: http://cdn.akamai.steamstatic.com/steam/apps/440/manuals/SentryManual_web.pdf?t=1412282215 http://cdn.akamai.steamstatic.com/steam/apps/440/manuals/Sen... Or this whole generation of manuals in general.