Henry Andrew Francken patent issued to Samuel Stringer, 1768 December 6, A2015-142. Scottish Rite Masonic Museum & Library.
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Henry Andrew Francken patent issued to Samuel Stringer, 1768 December 6, A2015-142. Scottish Rite Masonic Museum & Library. https://srmml.libraryhost.com/repositories/2/resources/2014 Accessed October 29, 2025.