diff --git a/uni/mmme/2044_design_manufacture_and_project/lecture_slides/Lecture 13a Machine System Design.pdf b/uni/mmme/2044_design_manufacture_and_project/lecture_slides/Lecture 13a Machine System Design.pdf new file mode 100644 index 0000000..f976baa Binary files /dev/null and b/uni/mmme/2044_design_manufacture_and_project/lecture_slides/Lecture 13a Machine System Design.pdf differ diff --git a/uni/mmme/2044_design_manufacture_and_project/lecture_slides/Lecture 13b Design and selection of springs.pdf b/uni/mmme/2044_design_manufacture_and_project/lecture_slides/Lecture 13b Design and selection of springs.pdf new file mode 100644 index 0000000..aab3f4c Binary files /dev/null and b/uni/mmme/2044_design_manufacture_and_project/lecture_slides/Lecture 13b Design and selection of springs.pdf differ