专利检索_ .防止接近线路的防护板或障碍物专利检索_ .防止接近线路的防护板或障碍物专利检索查询

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B61L29/023： ..{专用栏木}

序号	专利名	申请号	申请日	公开（公告）号	公开（公告）日	发明人
41	Gate mechanism	US44487221	1921-02-14	US1637575A	1927-08-02	MAX KUSHLAND; YOUNG HUGH E

42	Yinldable barrier for automatic railway-crossing gates	US8380926	1926-01-26	US1628651A	1927-05-17	BURRESS JOHN R

43	Automatic return gate	US4309525	1925-07-13	US1628622A	1927-05-10	DOHMANN EDWARD A

44	Railway gate	US69954524	1924-03-15	US1559321A	1925-10-27	ENSLEY HODGSON HARRIETTE

45	Railroad-crossing gate	US62570023	1923-03-17	US1553533A	1925-09-15	HOWARD JAMES R

46	Cattle guard for railroad tracks	US72646024	1924-07-17	US1540469A	1925-06-02	ILKO HARMATA

47	Safety appliance for railway crossings	US67771123	1923-11-30	US1510589A	1924-10-07	THOS ELLIOTT GARDNER

48	Railroad-crossing apparatus	US38496620	1920-05-28	US1389535A	1921-08-30	CHARLES SCHWARTZEN

49	Side-dump-door latch for car and other doors.	US4411615	1915-08-06	US1291847A	1919-01-21	GREGG WILLIAM BURR

50	Grain-car door.	US1911654388	1911-10-12	US1038148A	1912-09-10	JOHNSON CHRIST J

51	Signal system.	US1905255503	1905-04-14	US801509A	1905-10-10	CHISHOLM VALENTIN

52	Signal system for mines.	US1903144508	1903-02-21	US742962A	1903-11-03	BOWMAN NEWTON K

53	Means for operating signals automatically at level crossings, &c.	US1902088150	1902-01-02	US695498A	1902-03-18	SEMAT LAURENT

54	Automatic gate for bridges.	US1899724256	1899-07-18	US638633A	1899-12-05	GROVER GEORGE E

55	Bridge-gate.	US1898698794	1898-12-09	US634717A	1899-10-10	CHESMAN HENRY

56	Frederick w	US577484D		US577484A	1897-02-23

57	Safety-gate for bridges	US486738D		US486738A	1892-11-22

58	Thomas a	US435347D		US435347A	1890-08-26

59	Amos barnes	US431027D		US431027A	1890-07-01

60	Farm-gate	US388071D		US388071A	1888-08-21

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