The NV Cultuur mij. Siloewok Sawangan established a company hospital for its kapoc estate, large 2320 ha, situated 35 km south-east of Pekalongan(Grote Atlas van NOI, p. 273). The establishment will have been somewhere in the 1920s, as there is a picture by the Tropeninstitute TM 10002367, dated 5 august 1927 and with the description ward in the hospital of the kapoc estate Silowok Sawanga in Central Java. Another picture of the same date (TMnr 10002366) mentions: dokter djawa applies bandages on an outpatient client of the estate Silowok Sawangan.