[GreenKeys] Metric system

[WA5CAB at cs.com]

Sorry but that is demonstrably not so.  So called "modern metric practice" 
has threads generally finer than UNF, screw head slots (and Allen sockets) 
finer thanTeletype practice, and screw/bolt heads smaller than anything else.

In a message dated 07/08/2017 11:59:38 AM Central Daylight Time, 
nagle at animats.com writes: 
>     Teletype machines, at least those from the 14/15 era, use mostly
> Unified National Fine threads.  Almost everything else in US practice,
> except some guns, uses coarse threads.  Teletype also used narrower
> screw slots than standard.  Those are design decisions also seen in
> modern metric practice.
> 
>                 John Nagle
> 

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480
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