function
aged
algebraic
background
calculate
calculation
closeup
cursor
detail
education
engineer
engineering
equation
exploration
focus
formula
glass
handbook
instrument
integral
isolated
knowledge
learning
lens
logarithm
logarithmic
loupe
magnification
magnifier
math
mathematics
multiplication
obsolete
old
optical
research
ruler
scale
school
science
scientific
slide
study
technology
used
vintage
定額
Handbook of mathematics, magnifying glass and a slide rule isolated on black backgroundの素材 [FY31067522574]
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