Company Names, addresses, dates:
  Harry W. Thomas, 238 Main Street, Danville VA (c.1902-c.1908) ¹

Notes:
Harry Wellington Thomas (1869-19??) was a druggist in Danville VA.²
His drug store shows up at 238 Main Street in the Danville City directories for 1902-1908. I don't have access to any Danville directories between 1908 and 1917, so his drug store must have shut down sometime in that time range. The 1917 directory lists Frank McFalls drug store at that address (238 Main Street). There is also a bottle from Danville that is embossed with "McFall & Thomas"³, so there was likely a partnership between Harry Thomas & Frank McCall before the drug store became Frank McCalls drug store.
The 1917 directory residential section said that Thomas was working as the manager of the Danville Drug Co.
In subsequent years, Thomas was listed as owning the "Thomas News Stand", so he got out of the drug store business... except in the 1937 city directory where he was listed as a pharmacist at the Frank McCall drug store. He seems to have retired after that.

More information about Danville drug stores is available at rdricketts blog.

Bottles:

Clear 5.0" bottle embossed: horizontal: (graduations 1OZ, 2OZ & 3OZ) vertical: H.W. Thomas / DANVILLE, VA.

These 4 bottles bottles are clear, 5" (3 oz), 4.5" (2 oz), 3.7" (1 oz) and 3.0" (4 dram) and are embossed: horizontal: 3iii (or 3ii, 3i, 3iv) vertical: Thomas' / DRUG / STORE base (left bottle): W T & CO / C / U. S. A. base (next bottle): W T & CO / A / U S A base (next bottle): W T & CO / A / U S A base (right bottle): * * * / W T & CO / U S A These bottles don't have a city embossed on them, so I'm not certain they're actually from H.W. Thomas of Danville. My only evidence is that rdricketts blog has a rubbing from a bottle with the same embossing as these, and that blog seems credible.