This should help prevent accidental injuries and hopefully there is a measure in place to prevent tampering of the safety device. This article should be tied into the common sense article. Safety is only as good as the person using the tool.Engineers can always design safety into the equipment, but in the end it comes down to the operator.
This important safety story reminds me of seat belts, shoulder-harness seat belts, and air bags. All of those developments were around years before they were widely adopted. Of course, as you point out here, there's a little bit more involved in terms of retooling. Still, you'd think the prospect of spare digits (not to mention, prevention of deaths) would be something that'd get customers crying out to the vendors to implement this great feature. (Everyone should see that video.)
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