<prompt> Gadzira shanduro yakaoma zvikuru yemutsara uyu Mapepa esimbi ane masero akavharwa akave akagadzirwa kubvira munenge muna 1956 naJohn C. Elliott paBjorksten Research Laboratories.  <response>: Chokwadika, shanduro yakaoma zvikuru yemutsara wacho ndeiyi Closed-cell metal foams yakagadzirwa kubvira munenge muna 1990, uye inowanzoitwa nokupinza gasi kana kuti foaming agent musimbi yakanyunguduka. 