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"OPTEC." Fullformexpand.com, https://www.fullformexpand.com/optec/694588. Accessed 22 Nov. 2025.
Fullformexpand.com, 2025. "OPTEC." Accessed November 22, 2025. https://www.fullformexpand.com/optec/694588.
"OPTEC." (n.d.). Fullformexpand.com. Retrieved November 22, 2025, from https://www.fullformexpand.com/optec/694588.
OPTEC. (2025). Fullformexpand.com. Available at: https://www.fullformexpand.com/optec/694588 (Accessed: 22 November 2025).