When both Columbia and RCA Victor announced improvements to the brittle 78-rpm records that dominated jazz recording until the late 1940s, how did the industry respond?

 The longer playing time of Columbia's 33 1/3-pm records immediately took over.

The small size of RCA Victor's 45-rpm records was embraced as the definitive new format. 

Record labels shunned the new technology, continuing to focus on manufacturing 78-rpm discs. Both 33 1/3- and 45-rpm vinyl records were accepted quickly

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