digital tablet
デジタルタブレット
adult
adults only
alternative energy
business
checklist
chemical
chemical plant
chemistry
complexity
computer
crate
crude oil
diesel fuel
employee
engineer
examining
freight transportation
fuel and power generation
glue
hardhat
headwear
horizontal
industry
inspector
latin american and hispanic ethnicity
manager
men
natural gas
occupation
occupational safety and health
oil field
oil industry
oil worker
one man only
one person
only men
outdoors
people
petrochemical plant
pipeline
place of work
portable information device
professional occupation
reflective clothing
safety
shipping
storage tank
technician
technology
usa
using digital tablet
wireless technology