Assertion: saxhorn's bore | /r/HasProperty | = 0.750 inch
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text: Very large bore (>= 0.750 inch) sousaphones, with oversized bells as large as 32 inches (81 cm) in diameter, were made by Conn ("Grand Jumbo" [46K (3-valve) & 48K (4-valve)]) and King ("Jumbo" [1265 (3- & 4-valve versions)] & "Giant" [1270 (3-valve) & 1271 (4-valve)]) in the mid-1920s and 1930s, and by Martin, York, & Buescher, but they disappeared from the catalogs during the Depression or at the onset of World War II.