@SFOMuseum Twitter Posts This is SFO Museum's archive of the @SFOMuseum Twitter account.
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Despite the "spruce" nicknaming, the H-4 was actually constructed primarily of birch due to weight concerns and restrictions on the use of aluminum during WWII. Numerous delays prevented it from being completed before the end of the war. #WingWednesday #avgeek . This tweet was posted on May 05, 2021.