[GreenKeys] Lubrication intervals for Model 28, 34, 35, and 37 Machines...

[Don Robert House]

Based on 8 hours of use each day Teletype Corporation recommends
the following lubrication intervals:

M28 - 60 wpm - 3,000 hours or 1 year
M28 - 75 wpm - 2,400 hours or 9 months
M28 - 100 wpm - 1,500 hours or 6 months

M35 - 100 wpm - 1,500 hours or 6 months
M37 - 150 wpm - 2,000 hours or 8 months

M34 - same intervals as M28

I have not yet located intervals for M12, 14, 15, 31, 32, 33, or 38