साँचा:R22
imported>Addbot द्वारा परिवर्तित १३:२१, ३१ जुलाई २०१३ का अवतरण (Bot: Migrating interwiki links, now provided by Wikidata on d:q11175175)
The chemical-risk Template:R22 generates the redirection title "R22: Harmful if swallowed" (as the link text for "R22"), which links to article "List of R-phrases" as the description page for all those R-codes. There are dozens of similar R-phrase templates.
Also see: साँचा:tl2 - template to link any rcode.