--- a/src/newgrf.cpp	Mon Jun 09 12:20:00 2008 +0000
+++ b/src/newgrf.cpp	Tue Jun 10 00:42:19 2008 +0000
@@ -1538,6 +1538,14 @@
 				ret = true;
 			} break;
 
+			case 0x21: // long introduction year
+				housespec->min_year = grf_load_word(&buf);
+				break;
+
+			case 0x22: // long maximum year
+				housespec->max_year = grf_load_word(&buf);
+				break;
+
 			default:
 				ret = true;
 				break;