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Magnifying glass and a slide rule on the old page with the calcu
Keywords:
education
blueprint
pencil
concepts
instrument of measurement
no people
studying
architecture
construction industry
ideas
drawing compass
plan
ruler
work tool
material
equipment
paper
planning
paperwork
business finance and industry
magnification
photographic enlarger
research
design
document
magnifying glass
occupation
engineering
glass
diagram
science
learning
industry
photographic slide
work slip
slide rule
engineering calculations
calculation architecture
construction calculation
the background for slides
business rules
paper rules
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