Does anyone have any information on the dating of Picketts by initial manufacture of Model Name/Number
e.g when did the following first appear?
Pickett Deci-Point (Model 1)
Pickett Model 2 Dual Base Log Log Reciprocal Scale
Pickett Model 3 Deci Log Log Vector
Model 3 Deci Multiphase Log Log
Pickett N3 Power Log Exponential
Pickett Model 4 Vector Hyperbolic Deci-Log Log
Pickett 4 Vector Hyperbolic Dual Base Log Log
There appears to be quite a lot of information available on the dates in which the various logos appear
but nothing direcly answering my question.