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序号	专利名	申请号	申请日	公开（公告）号	公开（公告）日	发明人
21	young	US272181D		US272181A	1883-02-13

22	John camidge	US251027D		US251027A	1881-12-20

23	Improvement in pipe-organs	US187261D		US187261A	1877-02-13

24	Improvement in pneumatic actions for pipe-organs	US179902D		US179902A	1876-07-18

25	Improvement in organ-valves	US164585D		US164585A	1875-06-15

26	Improvement in pneumatic actions for organs	US162450D		US162450A	1875-04-20

27	Improvement in pneumatic organ-actions	US150972D		US150972A	1874-05-19

28	Gael fogelberg	US101605D		US101605A	1870-04-05

29	Improvement in melody-attachment	US101452D		US101452A	1870-04-05

30	Organ	US10580D		US10580A	1854-02-28

31	Vacuum pump operated musical instrument	US3670617D	1971-06-25	US3670617A	1972-06-20	HAILE ERNEST
A vacuum pump operated musical instrument is herein described which includes a hollow cylindrical body. The body is formed to define at least one aperture in the cylindrical wall thereof. The hollow body is open at one end and closed at the opposite end. A piston is slidably mounted within the cylindrical body for reciprocation past the aperture. As the piston is moved past the aperture, in a direction from the closed end to the opened end of the hollow body, the piston draws a vacuum and then suddenly communicates that vacuum to the ambient through the aperture. Air rushing in from the ambient into the vacuum space is acted upon the size and configuration of the aperture to form an audible sound. A second piston arrangement may be disposed between the aperture and the closed end of the hollow body. The second piston arrangement may be manually positioned to vary the volume of the vacuum retaining space. The adjustment of the volume of the last mentioned space is operable to controllably vary the pitch of the sound caused by air rushing from ambient into that space. Alternatively, a sleeve member may be coaxially and slidably mounted over the open end of the tubular shaped body so as to be adjustable with respect to the aperture. Axial movement of this sleeve member is operable to controllably vary the pitch of the sound in response to the position of the sleeve member. A one way valve is mounted within the first piston as a compression relief mechanism when the first piston is moved toward the closed end of the tubular body, before commencing the vacuum stroke. If it is found that the vacuum formed between the two pistons is too great when both pistons are moved in opposite directions at the same time, the compression relief valve may be opened manually by a control mechanism associated with the first piston arrangement to dissipate some of the vacuum.
32	Pipe organs	US3468208D	1967-03-17	US3468208A	1969-09-23	STONE DON MARSHALL

33	Keyboard for chord organ	US80135459	1959-03-23	US3001434A	1961-09-26	LO DUCA THOMAS S

34	Pipe organ combinations	US53450955	1955-09-15	US2910907A	1959-11-03	BOWMAN SAMUEL G

35	Pipe organ assembly	US64334457	1957-03-01	US2892375A	1959-06-30	BOWMAN SAMUEL G

36	Musical instrument	US18205937	1937-12-28	US2167582A	1939-07-25	MCCORD HUGH A

37	Organ key-control apparatus	US11295636	1936-11-27	US2121262A	1938-06-21	RIESMEYER ROBERT G

38	Pipe organ	US6285836	1936-02-07	US2116040A	1938-05-03	QUAVE GEORGE M

39	Pipe organ	US67210033	1933-05-22	US2004168A	1935-06-11	MARKS ARTHUR H

40	Organ mechanism	US16007927	1927-01-10	US1723287A	1929-08-06	LOSH GEORGE E

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