Volvo introduced the Model 646 four-wheel drive backhoe loader in 1977. They are unloaded using a tractor and loader or skid-steer loader. They can be equipped with a backhoe, front loader, or other contracting equipment. In 1957 Case made the "320 Construction King" backhoe loader. The TR-85 tanks use a manual loader. They brought a Bobcat loader and a shipping container with engineer equipment. A microkernel-based system may boot via multiboot compatible boot loader. Example&colon; Steering-function for a wheel loader. The Hurd requires a multiboot-compliant boot loader, such as GRUB. Skid-steer development continued into the mid-1960s with the M600 loader. The Java class loader is written in Java. Ubuntu adopted it as the default boot loader in its 9.10 version of October 2009. A swingloader is a rigid frame loader with a swinging boom. However, there is currently an issue with the latest kboot boot loader provided by kernel.org. The main gun is fed by the "Korzina" automatic loader.