Abstract: Novel condensed, seven-membered ring compounds of the formula: ##STR1## [wherein R.sup.1 and R.sup.2 each represent hydrogen, halogen, trifluoromethyl, lower alkyl or alkoxy, or both jointly form tri- or tetramethylene; R.sup.3 is hydrogen, lower alkyl or aralkyl; R.sup.4 is hydrogen or alkyl, aralkyl or cycloalkylalkyl which may be substituted; X is a group represented by the formula S(O).sub.n (where n is an integer of 0 to 2); Y is a carboxyl group which may be esterified or amidated; m is 1 or 2] and salts thereof.These compounds exhibit inhibitory activity on angiotensin converting enzyme and so forth, and are of value as an agent for diagnosis, prevention and treatment of hypertension.

Abstract: Novel 3-amino-4-oxo-2,3,4,5-tetrahydro-1,5-benzoxazepine derivatives of the formula ##STR1## [wherein R.sup.1 and R.sup.2 are independently hydrogen, halogen, trifluoromethyl, lower alkyl or lower alkoxy, or both jointly form tri- or tetramethylene; R.sup.3 is hydrogen, optionally substituted lower alkyl or optionally substituted aralkyl; R.sup.4 is hydrogen, optionally substituted alkyl, optionally substituted aralkyl or optionally substituted cycloalkylalkyl; Y is a carboxyl group which may be esterified or amidated; m is 1 or 2] and salts thereof.These compounds and salts thereof exhibits inhibitory activity on angiotensin converting enzyme and so forth, and are of value as an agent for diagnosis, prevention and treatment of circulatory diseases (e.g. hypertension, cardiopathy, cerebral apoploxy).

Abstract: An automatic running work vehicle adapted to automatically run straight along a predetermined boundary of a running area by being subjected to steering control based on the combination of parameters detected by a follower sensor for detecting the boundary and an orientation sensor for detecting the running direction.

Abstract: A running vehicle having control means for judging whether an obstacle detected by a non-contact type obstacle sensor on a front portion of its body is at rest or in motion based on the result of detection and controlling the vehicle body so as to cause the body to detour the obstacle when it is at rest or to automatically stop the vehicle body when the obstacle is in motion.

Abstract: Load control for engine of vehicle for agricultural work with rotary working implement, for avoiding too much deviation of the working depth while preventing the engine from stopping under heavy overloading. The rotary working implement is automatically raised and lowered in accordance with the results of sensing the engine rotation and of the actual working depth. For prevention of the engine failure, the rotary working implement is unconditionally raised whenever engine rotation below a predetermined value is sensed.