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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
41	Practical small piano	US39228764	1964-08-26	US3296917A	1967-01-10	FINHOLM WILLIAM S

42	Portable keyboard structure and music retainer	US34731053	1953-04-07	US2722154A	1955-11-01	MARTHA NEUMARK

43	Keyboard	US31482852	1952-10-15	US2707896A	1955-05-10	MATHEWS JOSEPH A; HAROLD WHEELER

44	Piano construction with preassembled units	US64371346	1946-01-26	US2505804A	1950-05-02	FREDERICK STEIN CHARLES

45	Piano construction	US70010246	1946-09-28	US2486338A	1949-10-25	SPERRY RALPH W E; HORTH JACK C

46	Piano construction	US50576143	1943-10-11	US2387491A	1945-10-23	BETHUNE JOHN W

47	Musical instrument	US2300012D		US2300012A	1942-10-27

48	Upright piano	US30788839	1939-12-06	US2230928A	1941-02-04	PERCY BRASTED ROBERT

49	Miniature piano	US11938037	1937-01-07	US2199211A	1940-04-30	WILHELM SCHIMMEL

50	Piano	US10337636	1936-09-30	US2177486A	1939-10-24	HELLER HENRY R

51	Tone deflector for grand pianos	US10388536	1936-10-03	US2138669A	1938-11-29	TOWER HERSCHEL E

52	Cabinet piano	US4625035	1935-10-23	US2058001A	1936-10-20	COLWIN MARTIN B; JOSEPH SAUERLAND

53	Horizontal pianoforte	US797135	1935-02-25	US2024629A	1935-12-17	ARTHUR DALE ALBERT

54	Miniature upright piano	US61605432	1932-06-08	US1968695A	1934-07-31	WALDEMAR LUNDHOLM GUSTAF

55	Upright piano	US32473828	1928-12-03	US1794783A	1931-03-03	WALDEMAR LUNDHOLM GUSTAF

56	Musical instrument	US27931028	1928-05-21	US1747733A	1930-02-18	PATTERSON FRANKLIN P

57	Piano	US29018919	1919-04-15	US1694789A	1928-12-11	MUCKEY FLOYD S

58	Pianoforte	US74865624	1924-11-08	US1570513A	1926-01-19	EDGAR MAXTED-MASSEY

59	Piano-action protector	US54180722	1922-03-07	US1527002A	1925-02-17	MORGAN WILL H; MORGAN HENRY J

60	Piano.	US17191017	1917-05-31	US1294866A	1919-02-18	BORJA PHILIP M

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