Titles published by Roberts:
Number of documents found: 3
- Emanuel Seibel, Orville R. Hagans
Title: Complicated Warches
SubTitle: [A series of papers first appearin in the American Horologist and in Swiss Horological Journal]
Keywords: complication
Edition: 1945
Page or pages: 136
BHM No: 2029 - W[illiam] H. Samelius, Charles Purdom
Title: It's Timing That Counts
Other Keywords: Watchmaster timer
Edition: 1944
Page or pages: 64
BHM No: 3364 - Charles Purdom, Orville R. Hagans
Title: Scientific Timing
Keywords: theory practical how-to performance
Other Keywords: watchmaster
Edition: 1947
Page or pages: 144
BHM No: 5500
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