[GreenKeys] Determining the age of a Model 15-KSR

[Charles Ring]

On 3/17/2014 1109, Jim Haynes wrote:
> Wish I could help, but I don't know any more than the rest of you.
>
> In addition to the factors John mentions, there was all the cast iron
> early on, replaced later by aluminum.  I don't know if both materials
> were used at the same time.  Some units made for the Army in WW-II are
> cast iron - maybe aluminum was in short supply.  Maybe aluminum castings
> imply post WW-II, but I don't know that aluminum was not used earlier.
>
> jhhaynes at earthlink dot net
>

Was the change from pulling to holding magnets a date marker or were 
both available at the same time?

-- 
*Charles Ring W3NU*
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