In a publication by the Danmarks Tekniske Museum Arbog, an aircraft, also on display at the museum, appears with a 7-cylinder radial engine built by Viggo Jensen, an employee of the Christiansen company, which also built the aircraft that mounted it, a type of Bleriot.

“Christiansen with Viggo”

From Appendix 9: The engine referred to in the main text, of this brand, of which only an illustration of the aircraft that installed it is offered, has now been photographed by Evzen V., who kindly offers it to us.

“Viggo Jensen's 7-cylinder Radial”

“Semi-rear view of Viggo Jensen”