Johnnie designed the Sebra 1020 Blood Shaker which could weight blood consistently plus or minus 3 grams. Previous designs could not get closer than plus or minus 10 grams. His design remained relevant and on the market for decades.
Sebra 1020
Johnnie designed the Sebra 1020 Blood Shaker which could weight blood consistently plus or minus 3 grams. Previous designs could not get closer than plus or minus 10 grams. His design remained relevant and on the market for decades.
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