| 1928 WHEELER WELLINGTON Semirigid Airship Patent |
| 1928 WHITTLESEY JOHN Airship Patent Print Art |
| 1928 CORBETT Airship Mooring Mast Patent Print |
| 1928 ISRAEL WILLIAMS Airship Patent Print Art |
| 1928 FOX RALPH Dirigible Airship Patent Print |
| 1928 ZEPPELIN LUFTSCHIFFBAU Rigid Airship Patent |
| 1928 HERMANN NAATZ Nonrigid Airship Patent Print |
| 1928 LIDBACK LEONARD Airship Patent Print Art |
| 1928 AUGUST FABER Dirigible Airship Patent Print |
| 1928 POWELSON WILFRID Airship Patent Print Art |
| 1928 CRANE RICHMOND Airship Patent Print Art |
| 1928 LANGDON JESSE Airship Patent Print Art |
| 1928 DORR WILHELM Gas Inflated Airship Patent |
| 1928 KARL Gas Supported Airship Patent Print Art |
| 1928 EBERHARD Gas Inflated Airship Patent Print |
| 1928 NEVILLE WALLIS Rigid Airship Patent Print |
| 1928 KARL ARNSTEIN Airship Hull Patent Print Art |
| 1928 WILLIAM AUBERLIN Airship Anchorage Patent |
| 1928 MCLAUGHLIN ROBERT Airship Patent Print Art |
| 1928 DONALDSON ROY Airship Patent Print Art |
| 1928 ALFRED RYAN Rigid Airship Patent Print Art |
| 1928 ALLEN BRADFORD Airship Patent Print Art |
| 1928 KARL ARNSTEIN Rigid Airship Patent Print |
| 1928 MAMMEN LAWRENCE Airship Patent Print Art |