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clockmaking
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View Pennsylvania clocks and clockmakers By George H. Eckhardt 
Pennsylvania clocks and clockmakers
By George H. Eckhardt
View Reasons for the bill, entituled, a bill for securing to Mr. John Hutchinson the property of a movement invented by him for the more exact measuring of time, both in motion and at rest; in answer to those offered by the clock-makers of London against it By John Hutchinson
Reasons for the bill, entituled, a bill for securing to Mr. John Hutchinson the property of a movement invented by him for the more exact measuring of time, both in motion and at rest; in answer to those offered by the clock-makers of London against it
Reasons for the bill, entituled, a bill for securing to Mr. John Hutchinson the property of a movement invented by him for the more exact measuring of time, both in motion and at rest; in answer to those offered by the clock-makers of London against it
By John Hutchinson