Which groundbreaking scientific product was initially marketed under the brand name 'Chardack-Greatbatch' before being rebranded with a more consumer-friendly name that became globally recognized?

Scientific advancements often lead to revolutionary products that change our world. But the path from laboratory to marketplace requires effective branding strategies that communicate complex innovations to the public. This trivia question explores how a major scientific breakthrough was successfully branded and marketed to become a household name, demonstrating the crucial intersection between scientific innovation and brand strategy.

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The implantable cardiac pacemaker (later branded as 'Medtronic')
The DNA sequencing machine (later branded as 'Illumina')
The scanning electron microscope (later branded as 'JEOL')
The mass spectrometer (later branded as 'Thermo Fisher')