Company Names, addresses, dates¹:
  Smithson & Mazinger, 359 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 (ca.1849-1915)² was born in Washington DC³.
The residential section of Washington DC directories lists his occupation was "bottler" in various years, on-and-off between 1867 and 1892. In 1890 and 1891 his occupation was listed as "foreman". So it seems he was a worker in the bottling business during that time, learning the business and moving up in his position.

Starting in 1893, the "Smithson & Mazinger" bottling establishment was listed in the city directories, so it seems he became a co-owner of a bottling company at that time.

Their bottling works was referred to as "The South Washington Bottling Works, Smithson & Mazinger proprietors" by an ad in the March 31st 1893 Evening Star newspaper (page 1), which noted that they had moved from 359 M Street SW to 462 H Street SW, which had "greatly increased facilities" so they could supply their patrons with "the Finest Carbonated Beverages and Bottled Beer".
An entry in the November 5th, 1898 issue of the Evening Star newspaper (page 3) said that R.T. Mazinger was moving from 462 H Street SW to 359 M Street SW, so it appears that about the same time his partnership with Smithson broke up, he moved back to the address where their business had started from.
In 1902, he was listed as both a Bottler & Wholesale Liquor dealer⁴.
Mazinger passed away on March 24, 1915⁵.

William A. Smithson (1870-1938)⁶ was also born in Washington DC. He was partnered with Mazinger from 1893-1897. Before that, he was partnered with his brother Charles C. Smithson, selling Coal under the name "C.C. Smithson & Bro". His occupation is not listed in the 1898-99 city directories, but in later years he is listed as owning a Livery business.


Smithson & Mazinger Bottles:

	book # 648 This is a 6.5" aqua hutchinson-shaped bottle with a baltimore-loop top. It is embossed: round slugplate: SMITHSON & MAZINGER / WASHINGTON / D.C. rear heel: McC 2
	book # 649 This is a 7.4" aqua hutchinson bottle embossed: front: SMITHSON & MAZINGER / 462 H. ST. S.W. / WASHINGTON, D.C. / REGISTERED 1894. base: S&M
	book # 650 This is a 6.5" aqua hutchinson bottle. It is embossed with the same slug plate as the bottle 2-rows above, except that bottle has a baltimore-loop top, and this one has a normal hutchinson top. It is embossed: round slugplate: SMITHSON & MAZINGER / WASHINGTON / D.C. rear heel: McC 2
	book # 651 This is an 8.8" aqua blob-top bottle embossed: round slugplate: SMITHSON & MAZINGER / 462 H. ST. S.W. / WASHINGTON, D.C. back: THIS BOTTLE / NOT TO BE SOLD base: S&M
	book # 651 This bottle differs from the one above in that it is has a baltimore-loop top, and it has "1894" embossed in the slugplate. It's 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
	book # 652 This is a 9" aqua BIM crown-top bottle, with the same embossing as the baltimore-loop-top bottle above. It is embossed: round slugplate: SMITHSON & MAZINGER / 462 H. ST. S.W. / 1894 / WASHINGTON, D.C. back: THIS BOTTLE / NOT TO BE SOLD base: S&M

	book # 386 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
	book # 387 Compare this to #649 a few rows above... This bottle appears to be made from the same mold as that bottle, but the words "SMITHSON &" were peened out, and replaced with "R. T.". Also, the address was altered, and the last digit of the year was altered. It is a 7.3" clear hutchinson bottle embossed: front: R. T. MAZINGER / 359 M. ST. S.W. / WASHINGTON, D.C. / REGISTERED 1898. base: S&M
	book # 389 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
	book # 390 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.
	book # 393 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.
	book # 393 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.
	book # 394 (right) & 396 (left) The left bottle is an 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 an 8.75" clear crown-top embossed: shoulder: REGISTERED oval pattern: MAZINGER / 359 [M] ST / BOTTLER / SW / WASHINGTON / DC lower front: THIS BOTTLE / NOT TO BE SOLD The difference (besides color) is that one has a slug-plate and the other doesn't.
	book # 395 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
	book # 397 These bottles have nearly identical slug plates. Left bottle is 9.5" tall and aqua, and the right bottle is 9" tall and clear. The left bottle is embossed: oval slugplate: R.T. MAZINGER / 462 H. ST. S.W. / REGD / 1898 / WASHINGTON, D.C. back: THIS BOTTLE NEVER SOLD and the right bottle is embossed: oval slugplate: R.T. MAZINGER / REGD. / 462 H. ST. S.W. / 1898 / WASHINGTON, D.C. below slugplate: REGISTERED / THIS BOTTLE IS NEVER SOLD rear heel: A G W

book # (unlisted in the syphon-seltzer section) This is a syphon-seltzer bottle. I'm not sure if it's painted or etched, but it says: front: SMITHSON & MAZINGER / TRADE (SM monogram) MARK / REGISTERED,1895 / WASHINGTON, D.C.