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Research Lab Tests 236-283
Doble Steam Motors Test #270
Doble Steam Motors Test #262 (recto), page 1A
Doble Steam Motors Test #262 (verso), page 1A
Doble Steam Motors Test #262 [Photostat Graph], page 2
Doble Steam Motors Test #263
Doble Steam Motors Test #264
Doble Steam Motors Test #265 [Photostat Graph]
Doble Steam Motors Test #266
Doble Steam Motors Test #267
Doble Steam Motors Test #268
Doble Steam Motors Test #269, page 1
Doble Steam Motors Test #269, page 2
Doble Steam Motors Test #270
Doble Steam Motors Test #271
Doble Steam Motors Test #272
Doble Steam Motors Test #273
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