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Beautiful design and craftsmanship, cherokeerunning!
Your statement that "The OR gate implements logical disjunction; the result is High (1) only when one of the inputs is High (1) as seen in the truth table shown in Figure 2" is incorrect. For the 2-input OR gate shown in Fig. 2, a high at either or BOTH inputs results in a high output. See your own truth table.
highs at both inputs A and B will also produce a high at the output.An exclusive OR meets your description