Chinese Version(中文版)
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EBooks(电子书)
Ems
[emz]
Examples
Operated
by
a
single
person
,
the
Mergenthaler produces
and
assembles linotypes
ready
for
the
press
or
stereotyping
table
at
the
rate
of
from
3,600
to
7,000
ems
(
type
characters
)
per
hour
.
William Henry Doolittle.
Inventions in the Century
.
Editor: Shanna
