diff --git a/server/routers/dry-wash/arm-master.js b/server/routers/dry-wash/arm-master.js
index 9c61f10..7e95334 100644
--- a/server/routers/dry-wash/arm-master.js
+++ b/server/routers/dry-wash/arm-master.js
@@ -16,10 +16,9 @@ router.post("/masters/list", async (req, res, next) => {
     const masters = await MasterModel.find({});
 
     const orders = await OrderModel.find({
-      startWashTime: {
-        $gte: start,
-        $lt: end,
-      },
+      $or: [
+        { startWashTime: { $lt: end }, endWashTime: { $gt: start } }
+      ]
     });
 
     const mastersWithOrders = masters.map((master) => {