doi:US3446939 ALowe Leonard FMorgan Lemuel JUSUS3446939 1966年9月8日 1969年5月27日 Patterson Kelley Co Electric immersion water heaterUS3446939 * Sep 8, 1966 May 27, 1969 Patterson Kelley Co Electric immersion water heater
Flow heater (1) consists of 20 18mm copper pipes each soldered onto 2 x 90[deg] copper pipe bends (2). The individual branches are all arranged on top of one another. The upper and lower ends of the heat exchanger are tapered to a width of 15mm using soldered pipe fitting and ...