The following data is extracted from Genealogy of the Switzers.
The Historical Society of Pennsylvania
1300 Locust Street
Philadelphia, December 26, 1912
Mrs. Cornelia Switzer Burkholder,
In response to your request I note the following names in The Pennsylvania Archives, Second Series, Volume XVII.
Valentine Schweitzer, ship Lydia, Capt. John Randolph, from Rotterdam. Qualified Oct. 13, 1749 (P.304).
Johannes Schweitzer, Ship Patience, Capt. Hugh Steel, from Rotterdam, Qualified Sept. 17, 1753. (P. 387)
Johannes Schweitzer, same as above. (P. 454).
Nicholas Schweitzer, Ship Snow Squirrel, John Benn, Master, from Rotterdam; last from Portsmouth. Qualified Oct. 21, 1761. (P. 454).
Trusting this will be satisfactory, I am,
Ernest Spofford, Assistant Librarian
Source: Genealogy of the Switzers