The "manual switch" was provided largely by Holm's own operator, Maria "Maja" Hjerpe (born Viklund, 1912).
ການ "ຄູ່ມືການປ່ຽນແປງ" ໄດ້ຖືກສະຫນອງໃຫ້ໂດຍສ່ວນໃຫຍ່ແມ່ນບໍລິວານຂອງຕົນເອງ Holm ຂອງ, Maria "Maja" Hjerpe (ເກີດ Viklund, 1912).