They are showing a Julia Child marathon on PBS and they showing a few old episodes and there are a beautiful set of I think Hotpoint Washer and Dryer in the kitchen. I just wished it was in color to see if it was in avocado or coppertone....
One of the early black-and-white runs was filmed at Boston Gas, and I would doubt if it would be Hotpoint. Could be, though.
However, I do know for a fact, that the later B & W shows were filmed with Frigidaire appliances. Says so in "The French Chef Cookbook."--in the acknowledgements, though. Julia NEVER, EVER did a commercial for a product, unlike Jim Beard or Craig Claiborne. Alton Brown seems to be following in her non-endorsement footsteps. In the preface to "The French Chef Cookbook," she tells a story of how the cooktop was not properly grounded, and she got a shock from the lavalier microphone she was wearing.
In "From Julia Child's Kitchen," she first mentions the Cuisinart, though never using the brand name, She came up with a very funny description, something like "Super-blender-shredder-food processor."
She also mentions in "From...." how she dried her newspaper in the microwave and caught the thing on fire.