Kari Häkkinen

The progress of technology and safety in materials handling

Kari Häkkinen, 1982 .

Efficiency and practicability of safety latches in lifting hooks

Kari Häkkinen, Jukka Mäkeläinen, 1985 .

Experiments on safety in the use of portable ladders

Kari Häkkinen, Jussi Pesonen, Erkki Rajamäki, 1988 .

Crane accidents and their prevention

Kari Häkkinen, 1978 .