Technical Data TD 102 Improved Friction Jeweling
7-29 1000-1-30-31 1000-5-25-35 1000-6-15-36 Revised 1000-4-25-38 1000-9-27-39 Hamilton Issued about 30 technical documents (TD’s) prior to WWII. I plan to use post each one in a readable format. Age rendered the TD’s difficult to read and understand. Grades 989, 989E, 995, 995A, 997, 980, 980A, 980B, 982, 987A are jeweled by an improved system, absolutely […]
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