Falling Derrick Method of Tilting Up a TowerA homemade 16 foot falling derrick to tilt up a 50 foot high, 18 inch wide Glen Martin aluminum tower by N6RK |
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Falling Derrick Method of Tilting Up a TowerA homemade 16 foot falling derrick to tilt up a 50 foot high, 18 inch wide Glen Martin aluminum tower by N6RK |
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