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![Identified! [Device that impresses the Great Seal of the United States on certain official documents] (LOC)](http://farm1.static.flickr.com/750/21702257288_7101b2318b_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)
![Identified! [Walter S. Lemmon (left), developer of the radio typewriter with a radio engineer testing the device at the Bureau of Air Commerce of the Department of Commerce]](http://farm66.static.flickr.com/65535/52053125107_99ec9fed04_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)
No known copyright restrictions(著作権制限なし)

by The Library of Congress
No known copyright restrictions(著作権制限なし)
No known copyright restrictions(著作権制限なし)
![Identified! [Sarah Keefe, teletype operator demonstrating sending Weather Bureau, Bureau of Standards weather maps using a teletype device in the offices of the American Telephone and Telegraph Co., Washington, D.C.]](http://farm66.static.flickr.com/65535/52054407294_f446933cca_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)
![Identified! [Man with a US Navy Department photoradiogram (or photo-radiogram), probably related to the first message sent between the Navy Department and the flagship of the president]](http://farm66.static.flickr.com/65535/52054656575_2095a16507_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)

by The Library of Congress
No known copyright restrictions(著作権制限なし)
![[President Coolidge and Mrs. Coolidge with dog outside White House, Washington, D.C.] (LOC)](http://farm66.static.flickr.com/65535/51162888667_3d5b390b17_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)
![Identified! [Man holding a Weston Electrical Instrument Model 322 microammeter at a window]](http://farm66.static.flickr.com/65535/52054654545_d1737c1355_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)
![Identified! [Charles Greeley Abbot, astrophysicist and Secretary of the Smithsonian, with his device: a silver-disc pyrheliometer which measures direct beam solar irradiance] (LOC)](http://farm1.static.flickr.com/765/21899747561_754c9fc5f9_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)

by The Library of Congress
No known copyright restrictions(著作権制限なし)
![Identified! [Underwater breathing devices: "Dräger Gegenlunge" (left), "Momseng Lung" (center), and "Davis Submerged Escape Apparatus" (right)] (LOC)](http://farm6.static.flickr.com/5635/21701991690_1bebc0c71e_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)

by The Library of Congress
No known copyright restrictions(著作権制限なし)
No known copyright restrictions(著作権制限なし)
![Identified! [Model train showing how coal is mined, first produced for the 1904 Louisiana Purchase Exposition in 1904 and donated in 1913 to the Smithsonian where it was displayed in the southwest court of the Arts & Industries Building] (LOC)](http://farm66.static.flickr.com/65535/50546800723_6746d65f2a_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)
![Identified! [Daniel W. Kessler of the National Bureau of Standards with device used to test slabs of marble over long periods of time] ? (LOC)](http://farm6.static.flickr.com/5684/21863932506_539282f8f1_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)
No known copyright restrictions(著作権制限なし)
No known copyright restrictions(著作権制限なし)
![Identified! [Men with weather balloon on roof of U.S. Weather Bureau building, Washington, D.C.] (LOC)](http://farm6.static.flickr.com/5681/21863914306_7a25616199_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)
No known copyright restrictions(著作権制限なし)
No known copyright restrictions(著作権制限なし)
![Identified! V. Valtra Parma, [Library of Congress Rare Book Division curator with a collection of miniature books] (LOC)](http://farm66.static.flickr.com/65535/50547669962_71d0a1c1b5_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)
![Identified! [Demolition of the Boulevard(?) apartment block to prepare for the construction of the War Office in Washington, D.C. in 1940] (LOC)](http://farm8.static.flickr.com/7304/16401961492_4eafda0f7e_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)
![Identified! [Grace Coolidge and Oberlin president Henry Churchill King planting a tree at the Lincoln Memorial on Nov. 6, 1923, honoring the Oberlin Elm which had stood for over 200 years] (LOC)](http://farm66.static.flickr.com/65535/50547671902_2e4f1d2712_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)
No known copyright restrictions(著作権制限なし)