[TowerTalk] LM-470 Variations

[Bob Selbrede, K6ZZ]

Hello,

In researching specification information on the Tri-ex
LM-470 I see comments suggesting that the LM-470 has
undergone some design/specification changes over the years. 
Does anyone have factual information regarding this?  Are
there differences between the LM-470, LM-470D and LM-470E? 
Is the Tashjian Towers LM-470E identical to the older Tri-ex
LM-470?  Anyone care to shed some light on the subject?

Thanks!

73, Bob K6ZZ