It was made by Birtman, but collected in 1915 by Bissell. They made an electric upright vac in the 1910s, and collected their competitors, kinda like what Hoover did. GRPM has most of them, and will supply additional pics of any if you ask. That's why the pics of the Bee D are so detailed, the old ones stunk so I asked for follow up pics, as I have the motor to one and would like to build the wheel supports, etc.
The patent date on mine is July 23rd 1912, and there is a patent in my Google Patent thread(reply 2) showing the original version, most likely what was originally a Bee model A, if such a thing existed.