1.1 This part of ISO 3691 applies to. pedestrian-propelled straddle stackers (3.1.1),. pallet stackers (3.1.2),. industrial trucks with capacities not exceeding 1 000 kg with manual electrical battery-powered lifting,. low-lift pallet trucks (3.2) with lift height up to 300 mm and rated capacity up to 2 300 kg,. scissor-lift pallet trucks (3.3) with lift heights up to 1 000 mm or rated capacity up to 1 000 kg with manual or electrical battery-powered lifting.These products are hereinafter referred to as “trucks”, equipped with load-handling devices for normalindustrial duties, e.g. fork arms and platforms, or integrated attachments for special applications.