Wednesday Advertising Day.
These were always done together, so I joined them here as well.
Rustu and Dusty seems to have been drawn by Elmer Wexler, whose earlier (and remarkable) newspaper strip work om Vic Jordan was shown here on several occasions. He joined Johnstone and Cushing in the forties and for the rest of his career as comic strip artist he only drew ads. In the article about that company in Hogan's Alley Rusty and Dusty were included in his portfolio. At any rate, the whole of this long running series were drawn by the same artist in this style.
The same can not be said for the second strip. Although The Trouble Twins are most famous for being the advertising work that got Dik Browne his job in Hi and Lois, by the time this sample appeared, he was already gone. Although he did do some advertising in the following years, they were more in his later style (samples can be seen under the Camel tag). Superficially similar to Browne's twins, these seem to me to have been drawn by Bill Williams.