Boston Postal Pneumatic Tube System, Dedication August 6, 1926.
| U.S. Senator, Hon. William M. Butler, preesing button to dispatch first container, which carried an American flag and letters addresed to The President, the Postmaster General and other prominent citizens. Back row, Hon. Frank E. McMillan, Hon. T.G. Mallalieu, Congressman Dallinger. Front row, Assistant Postmaster General Bartlett, Postmaster Baker, Congressman Douglass, Congressman Gallivan, Senator Butler.|