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31. Manual of classification [replacement pages]; Jan. 1968.

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
Date:: [1968.]
SuDoc number:: C 21.12:967/rev.pages-2

32. Manual of classification [replacement pages]; Oct. 1968.

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
Date:: [1968.]
SuDoc number:: C 21.12:967/rer.pages-5

33. Manual of classification [replacement pages Incorporating all changes therein directed by Classification orders issued subsequent to Mar. 31, 1967, and prior to July 1, 1967.

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
Date:: July 1967
SuDoc number:: C 21.12:963/rev.pages 19

34. Manual of classification [replacement pages incorporating changes directed by Classification orders issued subsequent to Dec. 31, 1966 and prior to Apr. 1, 1967.

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
Date:: Apr. 1967
SuDoc number:: C 21.12:983/rev.pages 18

35. Manual of classification [replacement pages]; Oct. 1967.

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
Date:: [1967.]
SuDoc number:: C 21.12:967/rev.pages

36. Manual of classification.

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
Date:: [1967.]
SuDoc number:: C 21.12:967

37. Manual of Classification (replacement pages incorporating changes directed by classification orders issued subsequent to June 30, 1966, and prior to Oct. 1, 1966.]

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
Date:: [1966.]
SuDoc number:: C 21.12:963/rev.pages-16

38. Manual of classification [replacement pages incorporating changes directed by Classification orders issued subsequent to Dec. 31, 1965, and prior to Apr. 1, 1966.]

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
Date:: [1966.]
SuDoc number:: C 21.12:963/rev.pages-14

39. Manual of classification [replacement pages incorporating changes directed by Classification orders issued subsequent to Mar. 31, 1966, and prior to July 1, 1966].

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
Date:: [1966.]
SuDoc number:: C 21.12:963/rev.pages-15

40. Manual of classification [replacement pages incorporating changes directed by Classification orders issued subsequent to Sept. 30, 1966, and prior to Jan. 1, 1967]

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
Date:: [1966.]
SuDoc number:: C 21.12:963/rev.pages-17

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