diff --git a/src/windows/editor_inventions_list.c b/src/windows/editor_inventions_list.c
index 4e4edfc01f..ac2e6ac82d 100644
--- a/src/windows/editor_inventions_list.c
+++ b/src/windows/editor_inventions_list.c
@@ -158,19 +158,97 @@ rct_research_item *_editorInventionsListDraggedItem;
 #define WindowHighlightedItem(w) *((rct_research_item**)&(w->var_494))
 
 static void window_editor_inventions_list_drag_open(rct_research_item *researchItem);
+static void move_research_item(rct_research_item *beforeItem);
 
 static int research_item_is_always_researched(rct_research_item *researchItem)
 {
 	return (researchItem->entryIndex & 0x60000000) != 0;
 }
 
+/* rct2: 0x0068596F */
+static void sub_68596F(){
+	// Reset all objects to not required
+	for (uint8 object_type = OBJECT_TYPE_RIDE; object_type < 11; object_type++){
+		uint8* esi = RCT2_ADDRESS(0x0098DA38, uint8*)[object_type];
+		for (uint8 num_objects = object_entry_group_counts[object_type]; num_objects != 0; num_objects--){
+			*esi++ = 0;
+		}
+	}
+
+	// Set research required for rides in use
+	for (uint16 rideIndex = 0; rideIndex <= 0xFF; rideIndex++){
+		rct_ride* ride = &g_ride_list[rideIndex];
+		if (ride->type == RIDE_TYPE_NULL)continue;
+		RCT2_ADDRESS(0x0098DA38, uint8*)[OBJECT_TYPE_RIDE][ride->subtype] |= 1;
+	}
+
+	for (rct_research_item* research = gResearchItems; research->entryIndex != RESEARCHED_ITEMS_END; research++){
+		if (research->entryIndex & (1 << 30))
+			continue;
+
+		// If not a ride
+		if ((research->entryIndex & 0xFFFFFF) < 0x10000)
+			continue;
+
+		uint8 ah = (research->entryIndex >> 8) & 0xFF;
+
+		uint8 object_index = research->entryIndex & 0xFF;
+		rct_ride_type* ride_entry = GET_RIDE_ENTRY(object_index);
+
+		uint8 master_found = 0;
+		if (!(ride_entry->var_008 & (1 << 13))){
+
+			for (uint8 rideType = 0; rideType < object_entry_group_counts[OBJECT_TYPE_RIDE]; rideType++){
+				rct_ride_type* master_ride = GET_RIDE_ENTRY(rideType);
+				if (master_ride == NULL || (uint32)master_ride == 0xFFFFFFFF)
+					continue;
+
+				if (master_ride->var_008 & (1 << 13))
+					continue;
+
+				if (!(RCT2_ADDRESS(0x0098DA38, uint8*)[OBJECT_TYPE_RIDE][rideType] & (1 << 0)))
+					continue;
+
+				if (ah == master_ride->ride_type[0] ||
+					ah == master_ride->ride_type[1] ||
+					ah == master_ride->ride_type[2]){
+					master_found = 1;
+					break;
+				}
+			}
+		}
+
+		if (!master_found){
+			if (!(RCT2_ADDRESS(0x0098DA38, uint8*)[OBJECT_TYPE_RIDE][object_index] & (1 << 0)))
+				continue;
+			if (ah != ride_entry->ride_type[0] &&
+				ah != ride_entry->ride_type[1] &&
+				ah != ride_entry->ride_type[2]){
+				continue;
+			}
+		}
+
+		research->entryIndex |= (1 << 30);
+		_editorInventionsListDraggedItem = research;
+		move_research_item(gResearchItems);
+		_editorInventionsListDraggedItem = NULL;
+		research--;
+	}
+}
+
+/* rct2: 0x0068590C */
+static void sub_68590C(){
+	RCT2_CALLPROC_EBPSAFE(0x0068590C);
+}
+
 /**
  *
  *  rct2: 0x00685901
  */
 static void sub_685901()
 {
-	RCT2_CALLPROC_EBPSAFE(0x00685901);
+	sub_68596F();
+	sub_68590C();
 }
 
 /**