INTRODUCTION
This Standard supersedes RS-209 and RS-209-1. It includes all
items prepared by JEDEC Committee JT-8 on Mechanical
Standardization, and approved by the Electronic Industries
Association up to April 1962.
It should be noted that this Standard differs from previous
issues in that reference letters are used on the diagrams instead
of numerals. The dimensions, both inch and metric, are given in
tabulated form. The metric conversion used is according to that
proposed by the International Organization for Standardization
(ISO) . Basis : 1 in. = 25.4 mm. (exactly). Unless otherwise noted,
the metric dimensions are derived from the original inch
dimensions.