News3 mins ago
patents
0 Answers
the first DC was patented in A 1872
TSBT was patented 1889
TSBT was patented 1889
Answers
Best Answer
Nobody has yet answered this question. Once some answers have been given, slickster will be able to select one answer as the best. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.There are no answers available for this question.