A Practical Treatise on the Balance Spring
Charles E. Fritts, of New York, N.Y.
Collection of Two Articles on Selenium Cells
A Practical Treatise on the Balance Spring
The Watch Adjuster's Manual ...
The Watch Adjuster's Manual - A Practical Guide for the Watch and Chronometer Adjuster in Making, Springing, Timing and Adjusting for Isochronism, Positions and Temperatures
The Watch Adjuster's Manual, Being a Practical Guide for the Watch and Chronometer Adjuster in Making, Springing, Timing and Adjusting for Isochronism, Positions and Temperatures, by Charles Edgar Fritts ("Excelsior")...
The Watch Adjuster's Manual
The Watch Adjuster's Manual, Etc
A Practical Treatise on the Balance Spring
The Watch Adjuster's Manual ... Third Edition, Revised and Corrected by the Author