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That looks like a Dendrobium, and it looks like a Dendrobium kingianum or a hybrid involving this species. They normally keep leaves for several years, then drop them. The pseudobulbs can last for several more years.
Everything I see is alive on your plant. Now that it is warm, and the plant is growing, give it plenty of light, water and fertilizer.
You can read more about Dendrobium kingianum in the Dendrobium forum here. Use the Search function in the top maroon menu to search on the name.
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