機器
accounting
adding
aged
analog
antique
arithmetic
arithmometer
background
business
calculate
calculation
calculator
cash
close
closeup
computer
count
design
device
equipment
finance
financial
manual
mathematics
mechanic
mechanical
mechanism
metal
money
number
obsolete
old
precision
rare
rarity
register
retro
rust
rusty
steel
sums
symbols
table
technology
tool
used
vintage
white
wooden