diff --git a/resources/master_data/scripts/master_formula.py b/resources/master_data/scripts/master_formula.py
index 926396b6..8f6ac76e 100644
--- a/resources/master_data/scripts/master_formula.py
+++ b/resources/master_data/scripts/master_formula.py
@@ -267,7 +267,7 @@ class Master:
                     if number in slot:
                         self.twice.add((key[:2], number))
                     slot.setdefault(number, row)
-        mp.EQ.set(self.numbers.get("EQ", {}))  # 기계 입력이 목록 밖 원문 분류번호도 받게
+        mp.EQ.set(self)  # 기계 입력이 목록 밖 원문 분류번호도 받게
 
     def get(self, ref: str) -> dict:
         tid, _, number = ref.partition(":")
@@ -503,6 +503,7 @@ def _inputs(row: dict, given: dict) -> dict:
                     pass
         if isinstance(value, (int, float)):
             value = Decimal(str(value))
+        value = mp.resolve(spec, value)  # 기계 EQ 키 → 원문 분류번호
         if "고르기" in spec and value not in spec["고르기"] and not mp.machine(spec, value):
             raise FormulaError(f"입력 「{name}」={value} 고르기 밖")
         if "범위" in spec:
diff --git a/resources/master_data/scripts/master_pick.py b/resources/master_data/scripts/master_pick.py
index f3f28ebf..185943f9 100644
--- a/resources/master_data/scripts/master_pick.py
+++ b/resources/master_data/scripts/master_pick.py
@@ -27,7 +27,7 @@ REGIONS = (
 ).split()
 
 CHOSEN: ContextVar[dict | None] = ContextVar("고름", default=None)  # {호표 줄 차례(0부터): 자재 키}
-EQ: ContextVar[dict | None] = ContextVar("기계번호", default=None)  # 기계 마스터 {원문번호: 줄}
+EQ: ContextVar = ContextVar("기계번호", default=None)  # 지금 쓰는 마스터 — 기계 줄을 찾음
 
 
 @contextmanager
@@ -40,9 +40,22 @@ def choosing(picks: dict | None):
         CHOSEN.reset(token)
 
 
+def _numbers() -> dict:
+    return EQ.get().numbers.get("EQ", {}) if EQ.get() else {}
+
+
+def resolve(spec: dict, value):
+    """기계 입력이 EQ 키로 오면 원문 분류번호로 풂 — 고르기 목록(원문번호)과 같은 꼴."""
+    if not (isinstance(value, str) and value.strip()[:2] == "EQ" and EQ.get()):
+        return value
+    row = EQ.get().index.get("EQ", {}).get(value.strip())
+    number = str(row.get("원문번호") or "") if row else ""
+    return number if number and machine(spec, number) else value
+
+
 def machine(spec: dict, value) -> bool:
     """기계 입력 — 고르기 목록 밖 원문 분류번호도 기계 마스터에 있으면 받음."""
-    known = EQ.get() or {}
+    known = _numbers()
     picks = spec.get("고르기") or []
     return bool(picks) and str(value).strip() in known and all(str(o) in known for o in picks)
 
diff --git a/resources/tester/test_m01_pick.py b/resources/tester/test_m01_pick.py
index 1e6215da..f911987b 100644
--- a/resources/tester/test_m01_pick.py
+++ b/resources/tester/test_m01_pick.py
@@ -112,3 +112,18 @@ def test_check_master_검색어_후보0_단위경고(client) -> None:
     assert "후보 0" in mf.check_pick(whole, "줄", {"검색어": "없는물건zzz"})[0]
     assert mf.check_unit(whole, "줄", {"검색어": "어닐링철선 서울 4.0mm"}, "kg") == []
     assert "성격이 다름" in mf.check_unit(whole, "줄", {"검색어": "어닐링철선 서울 4.0mm"}, "m")[0]
+
+
+def test_기계_입력은_EQ_키도_원문번호로_풀어_받음(client) -> None:
+    key = "GC000267"
+    number = "0101-0007"  # 고르기 목록 밖
+    eq = next(k for k, r in store.loaded()[1].index["EQ"].items() if r.get("원문번호") == number)
+    base = {**store.auto(key)["값"]}
+    by_number = client.post(
+        "/api/m01/calc", json={"key": key, "inputs": {**base, "기계": number}}
+    ).json()
+    by_key = client.post("/api/m01/calc", json={"key": key, "inputs": {**base, "기계": eq}}).json()
+    assert by_key["ok"] is True, by_key
+    assert by_key["sums"] == by_number["sums"]  # EQ 키 = 원문번호와 같은 계산
+    bad = client.post("/api/m01/calc", json={"key": key, "inputs": {**base, "기계": "EQ999999"}})
+    assert bad.json()["ok"] is False