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5171. Acoustic materials. Classification of acoustic materials.

Corporate/Agency Authors:: National Bureau of Standards
Publisher:: National Bureau of Standards
Date:: Jan. 3, 1939
SuDoc number:: C 13.16:541

5172. Air capacitors. Measurement of relative and true power factors of air capacitors [with list of references]; by Allen V. Astin.

Corporate/Agency Authors:: National Bureau of Standards
Publisher:: National Bureau of Standards
Date:: [1939.]
SuDoc number:: C 13.22/a:1138

5173. Air capacitors. Nature of energy losses in air capacitors at low frequencies [with list of references]; by Allen V. Astin.

Corporate/Agency Authors:: National Bureau of Standards and Commerce Department
Publisher:: National Bureau of Standards
Date:: [1939.]
SuDoc number:: C 13.22/a:1212

5174. Airplane cameras. Resolving power and distortion of typical airplane-camera lenses; by Francis E. Washer.

Corporate/Agency Authors:: National Bureau of Standards and Commerce Department
Publisher:: National Bureau of Standards
Date:: [1939.]
SuDoc number:: C 13.22/a:1216

5175. Airplane electric systems. Determination of optimum voltage for airplane electric systems; by Vernon H. Grant and Melville F. Peters.

Corporate/Agency Authors:: National Bureau of Standards and Commerce Department
Publisher:: National Bureau of Standards
Date:: [1939.]
SuDoc number:: C 13.22/a:1247

5176. Ampere. Absolute determination of ampere, using improved coils; by Harvey L. Curtis, Roger W. Curtis, [and] Charles L. Critchfield.

Corporate/Agency Authors:: National Bureau of Standards and Commerce Department
Publisher:: National Bureau of Standards
Date:: [1939.]
SuDoc number:: C 13.22/a:1200

5177. Boxes. Stock folding boxes for millinery.

Corporate/Agency Authors:: National Bureau of Standards
Publisher:: National Bureau of Standards
Date:: 1939
SuDoc number:: C 13.12/1:173

5178. Brass. Effects of aluminum and of antimony on certain properties of cast red brass [with list of references]; by Harold B. Gardner and Charles M. Saeger, jr.

Corporate/Agency Authors:: National Bureau of Standards and Commerce Department
Publisher:: National Bureau of Standards
Date:: [1939.]
SuDoc number:: C 13.22/a:1215

5179. Bubbler tip of pyrex glass for difficult absorptions; by Joseph R. Branham and Edward O. Sperling.

Corporate/Agency Authors:: National Bureau of Standards and Commerce Department
Publisher:: National Bureau of Standards
Date:: [1939.]
SuDoc number:: C 13.22/a:1214

5180. Building materials. Building materials and structures: Structural properties of one of Keystone beam steel floor constructions sponsored by H. H. Robertson Company [with selected references]; by Herbert L. Whittemore, Ambrose H. Stang, and Cyrus C. Fishburn.

Corporate/Agency Authors:: National Bureau of Standards
Publisher:: National Bureau of Standards
Date:: Dec. 29, 1938, [published] 1939
SuDoc number:: C 13.29:10

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