Assertion: electric organ | /r/HasProperty | unique type of instrument
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text: The Hammond organ is a wonderful and versatile musical instrument, but it became standard because it appeared on the market at the right time when it was a unique type of instrument with virtually no competition among other instrument makers (The Allen electronic organ company, emerging at almost the same time, chose to make only very large console organs that were permanently installed in churches, so they weren't really competing with the Hammond instruments).