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Petrus Harden (c1867-1921)
1921 Obituary 
PETRUS HARDEN died on August 2, 1921, in Stockholm, at the age of fifty-four.
After gaining experience at several Swedish steelworks, he became in 1895 associated with Dr. Tholander, engineer of the Jernkontoret in the construction and equipment of steel furnaces.
In 1909, in partnership with Dr. F. Kjellin, the inventor of the Kjellin electric furnace, he joined the firm Aktiebolaget Ingeniorsbyran Allians in Stockholm.
On the decease of Dr. Kjellin in 1910 he became sole proprietor and managing director of the company, a position he held until his death. The company was specially engaged in the construction of ore-concentrating machinery.
He was elected a member of the Iron and Steel Institute in 1908.
1921 Obituary 
PETRUS HARDEN died in Stockholm, Sweden, on August 2, 1921, at the age of fifty-four.
After serving with several Swedish steel plants and works, be started in 1895—together with the engineer Dr. Tholander, then of the Swedish Iron Institute " Jernkontoret "— his firm, P. Harden's Drawing Office, his work dealing especially with furnaces and technical constructions for ironworks.
In the year 1909, in partnership with Dr. Fredrik Kjellin, the inventor of the Kjellin electric steel furnace, he joined the firm Aktiebolaget Ingeniorsbyran Allians, in Stockholm. One year later, on the decease of Dr. Kjellin, he became sole proprietor and managing director of this company, a position which he held until the time of his death. In later years his company was specially engaged in constructional work and in the manufacture of machines for ore concentration.
Of the Swedish mines and ironworks it is hard to mention any one which did not make use of his wide experience. Besides this, he had many commissions in Great Britain, Italy, Japan, Norway, Spain, the United States, and other countries.
He was member of the Iron and Steel Institute, and was elected member of the Institute of Metals on September 17, 1915.