timeframe for reading from all devices

[dijkstra1930]

http://einstein.sv.cmu.edu/last_readings_from_all_devices/1368568895000/temp/csv

That takes 2 time stamps, and returns all readings in a range for all devices??? Or something like that:

http://einstein.sv.cmu.edu/readings_from_all_devices/1368568891000/1368568895000/temp/csv