Re: Re[4]: [ATM] Question about "Null-testing"

["Bob May" <bobmay@nethere.com>]

The injector razor blade is a version of a razor system where there is a
short depth blade which is injected into the holder from a cartrige.  It was
one of the "in" things back in the '60s to replace the double edged razor
blade.
To operate a blade change, you just stuck the cartrige into a hole in the
side of the blade holder and pushed on a button sideways to "inject" a new
blade into the blade holder.  The old blade fell out the far side from the
cartrige for disposal in the trash.
Bob May
bobmay@nethere.com
http://nav.to/bobmay
http://bobmay.astronomy.net

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