US527205-numbering machine (1) - Drawing. Public domain image.
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US436358-Sole cutting machine (3)
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US716903-Compound rotary engine (4)
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US717869-Rotary engine (3) - Drawing. Public domain image.
Patent held by Margareth E. Knight Public domain photograph of electrical equipment, power lines, engine, free to use, no copyright restrictions image - Picryl description
US109224-Improvement in paper-feeding machines (4)
Patent held by Margareth E. Knight
US220925-Paper bag machine (3) - Drawing. Public domain image.
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US720818-Rotary engine. (4) - Drawing. Public domain image.
Patent held by Margareth E. Knight
US109224-Improvement in paper-feeding machines (5)
Patent held by Margareth E. Knight
US716903-Compound rotary engine (7)
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US743293-Automatic tool for boring or planing concave or cylindroidal ...
Patent held by Margareth E. Knight Public domain photograph of electrical equipment, power lines, engine, free to use, no copyright restrictions image - Picryl description
US220925-Paper bag machine (2) - Drawing. Public domain image.
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US436358-Sole cutting machine (1)
Patent held by Margareth E. Knight
US494784-Sole cutting machine (3)
Patent held by Margareth E. Knight
US109224-Improvement in paper-feeding machines (3)
Patent held by Margareth E. Knight
US220925-Paper bag machine (1) - Drawing. Public domain image.
Patent held by Margareth E. Knight
US716903-Compound rotary engine (6)
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US220925-Paper bag machine (4) - Drawing. Public domain image.
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US743293-Automatic tool for boring or planing concave or cylindroidal ...
Patent held by Margareth E. Knight
US1068781-Internal combustion engine (1)
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US220925-Paper bag machine (5) - Drawing. Public domain image.
Patent held by Margareth E. Knight
US716903-Compound rotary engine (5)
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US720818-Rotary engine. (1) - Drawing. Public domain image.
Patent held by Margareth E. Knight
US109224-Improvement in paper-feeding machines (1)
Patent held by Margareth E. Knight
US519333-Window frame with sash (2)
Patent held by Margareth E. Knight
US521413-Reel (4) - Drawing. Public domain image.
Patent held by Margareth E. Knight
US720818-Rotary engine. (2) - Drawing. Public domain image.
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US743293-Automatic tool for boring or planing concave or cylindroidal ...
Patent held by Margareth E. Knight
US109224-Improvement in paper-feeding machines (2)
Patent held by Margareth E. Knight Public domain photograph of electrical equipment, power lines, engine, free to use, no copyright restrictions image - Picryl description
US716903-Compound rotary engine (2)
Patent held by Margareth E. Knight
US527205-numbering machine (3) - Drawing. Public domain image.
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US717869-Rotary engine (1) - Drawing. Public domain image.
Patent held by Margareth E. Knight Public domain photograph of building in Boston, Massachusetts, free to use, no copyright restrictions image - Picryl description
US743293-Automatic tool for boring or planing concave or cylindroidal ...
Patent held by Margareth E. Knight
US1068781-Internal combustion engine (2)
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US494784-Sole cutting machine (1)
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US494784-Sole cutting machine (2)
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US521413-Reel (1) - Drawing. Public domain image.
Patent held by Margareth E. Knight
US220925-Paper bag machine (6) - Drawing. Public domain image.
Patent held by Margareth E. Knight
US521413-Reel (3) - Drawing. Public domain image.
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US527205-numbering machine (2) - Drawing. Public domain image.
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US716903-Compound rotary engine (1)
Patent held by Margareth E. Knight
US716903-Compound rotary engine (8)
Patent held by Margareth E. Knight
US717869-Rotary engine (2) - Drawing. Public domain image.
Patent held by Margareth E. Knight
US717869-Rotary engine (4) - Drawing. Public domain image.
Patent held by Margareth E. Knight
US436358-Sole cutting machine (2)
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US519333-Window frame with sash (1)
Patent held by Margareth E. Knight
US521413-Reel (2) - Drawing. Public domain image.
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US716903-Compound rotary engine (3)
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US720818-Rotary engine. (3) - Drawing. Public domain image.
Patent held by Margareth E. Knight Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
US720818-Rotary engine. (5) - Drawing. Public domain image.
Patent held by Margareth E. Knight Public domain photograph of jet aircraft, free to use, no copyright restrictions image - Picryl description