Company Names, addresses, dates¹:
  Smithson & Mazinger, 349 M SW (1893)
  Smithson & Mazinger, 462 H SW (1894-1897)
  R.T. Mazinger, 462 H SW (1898)
  R.T. Mazinger, 359 M street SW (1899-1915)

Notes:
Richard T. Mazinger was born about 1859 in DC. He's listed in the 1910 Census as working in a Bottling Works. In 1902, he was a Bottler & Wholesale Liquor dealer². William A. Smithson was his partner from 1893-1897.

Bottles:

(enlarge)	This is an 8.8" aqua baltimore-loop bottle embossed: round slugplate: SMITHSON & MAZINGER / 462 H. ST. S.W. / 1894 / WASHINGTON, D.C. back: THIS BOTTLE / NOT TO BE SOLD base: S&M
(enlarge)	This is a 7.4" aqua hutchinson bottle embossed: front: SMITHSON & MAZINGER / 462 H. ST. S.W. / WASHINGTON, D.C. base: S&M
(enlarge)	These are 6.5" aqua hutchinson bottles. The one on the left has a baltimore-loop blob, and the one on the right has a normal blob. They're both embossed: round slugplate: SMITHSON & MAZINGER / WASHINGTON / D.C.
(enlarge)	This is a 7.5" clear hutchinson bottle embossed: tombstone slugplate: R.T. MAZINGER / REGD. / 462 H. ST. S.W. / 1989 / WASHINGTON D.C. / THIS BOTTLE / NOT TO BE SOLD
(enlarge)	These are 7.5" clear hutchinson bottles embossed: tombstone slugplate: R.T. MAZINGER / 359 / M. ST. S.W. / REGISTERED/ 1898 / WASHINGTON, D.C. lower front: AGW
(enlarge)	This is similar to the bottles above except for the shape of the slug-plate. It's a 7.7" sun-colored-amethyst hutchinson bottle embossed: round slugplate: R.T. MAZINGER / 359 M. ST. S.W. / REGISTERED / 1898 / WASHINGTON, D.C.
(enlarge)	Left is an 8" sun-colored-amethyst crown top bottle embossed: oval slugplate: R.T. MAZINGER / 359 / M. ST. S.W. / WASHINGTON, D.C. lower front: THIS BOTTLE NEVER SOLD lower back: REGISTERED The right bottle is the same except it is aqua, and the embossing is in an oval pattern vs. a slugplate.
(enlarge)	The left bottle is a 9.2" clear crown-top embossed: round slugplate: R.T. MAZINGER / 359 M ST SW / REGISTERED / WASHINGTON DC The right bottle is the same except it is aqua, and it's 9.0" tall.
(enlarge)	Left bottle is 8.5" clear crown-top embossed: shoulder: REGISTERED oval slugplate: MAZINGER / 359 [M] ST / BOTTLER / SW / WASHINGTON / DC lower front: THIS BOTTLE / NOT TO BE SOLD The right bottle is the same except it is aqua, it's 8.75" tall, and the embossing is in an oval pattern vs. a slugplate.
(enlarge)	This is a 9.5" clear crown top bottle embossed: fancy slugplate: MAZINGER / 359 [M] ST / BOTTLER / SW / WASHINGTON / DC lower front: REGISTERED base: RTM
(enlarge)	This is a 9.5" aqua crown top bottle embossed: oval slugplate: R.T. MAZINGER / 462 H. ST. S.W. / REGD / 1898 / WASHINGTON, D.C. back: THIS BOTTLE NEVER SOLD