1904
- October 4 -- The Bundy Manufacturing Co. purchases property from the Endicott Land Company.
- Buildings 1 and 15 provide 22,958 square feet of space.
1906
July 13 -- The Bundy Manufacturing Co. and the International Time Recording Company purchase property from the Endicott Land Company.
Harlow Bundy, a Binghamton, N.Y., manufacturer of time recorders, moves his business -- which had outgrown its second Binghamton factory -- into a new three-story brick building in Endicott, which locals call the "Bundy Building" even though the sign over the door reads "International Time Recording Company."
1907
- March 8 -- The International Time Recording (ITR) Company purchases property from the Endicott Land Company.
- All ITR operations are transferred to Endicott and ITR occupies the Bundy Building, which has approximately 18,000 square feet of space.
- Buildings 2 and 3 add 75,000 square feet of space.
1908
- January 2 -- The International Time Recording Company purchases property from the Bundy Manufacturing Company.
1908 - 1911
- Buildings 4, 5, 7, 9 and 10 add 74,042 square feet of space.
1910
- October 22 -- The International Time Recording Company purchases property from the Bundy Manufacturing Company.
1911
- ITR combines with the Computing Scale Company and the Tabulating Machine Company to become the Computing-Tabulating-Recording Company (CTR) -- the forerunner of IBM -- which produces scales in Dayton, Ohio; punched cards and tabulators in Washington, D.C., and time recorders in Endicott.
1913
- A two-story structure, known as the East Wing, is added to the original factory.
1914
Thomas J. Watson, Sr., becomes CTR's president.
The Endicott Engineering Laboratory develops a non-printing electric accounting machine, vertical card sorting machine, mechanical hand punch and a lever set gang punch.
Five buildings on the site now encompass 65,000 square feet of space. Endicott employs 245 people in manufacturing and two in engineering. There are approximately 100 power tools in the factory valued at about $50,000, and 1,000 tools, dies, jigs and fixtures. The plant is producing 11 classes of products, about 2,200 parts and is engaged in 6,600 different manufacturing operations.
1915
- The company band is formed.
1916
The International Time Recording Company Band (later the IBM Band) is officially organized with 32 members under the direction of Roy Collar.
1917
- The Endicott Engineering Laboratory develops a mechanical verifier.
- A third story is added to the factory. Also, two one-story buildings, known as the East and West Courts, are built.
1918
- The Endicott Engineering Laboratory develops an electric accounting machine improved through a new counter eliminating relays.
1919
- The plant produces products for CTR's Tabulating Machine Company and International Time Recording Company.
- Endicott employs 1,100 people.
- J. J. O'Brien serves as the plant superintendent.
- A special "A Day At The Endicott Plant" booklet illustrates and describes a special room for female employees thusly: "The monotonies of lunch hour for the young lady who lives too far to take lunch at home are quickly abandoned when the Victrola [phonograph] starts its little motor purring in this cozy rest room."
- The site baseball team is in third place in the Endicott Industrial Base Ball [sic] League.
- Every Wednesday at noon, site workers gather under the shade of "the big tree" on the grounds to enjoy the concert given by the employees' 30-piece band.