Brown Debossed HY-PRO Bleach Bottle. Maywood Glass. Glass Bottle Blowers Association.

Two Views of HY-PRO Bottle.

I couldn't get a real good photo of that one.  And I haven't found much on the Hy-Pro product or company.  The marks on the bottom of the bottle were helpful though.

Bottom of Hy-Pro Bottle.

The glass bottle manufacturing company that made this bottle is indicated by the MG mark, which indicates the Maywood Glass Company.

In 1936, Maywood operated two continuous tanks, making “flint amber and green proprietary ware, beverage and liquor bottles, packers’ ware, bottle specialties” by machine.

Here is the link for more about that company.

MaywoodGlass.pdf (sha.org)

The stylized GBBA mark is also interesting.  It indicates the Glass Bottle Blowers Association.

Here is some information about that workers group.

In 1891, after four years of labor unrest, the two KOL glass blowers' divisions merged to become the United Green Glass Workers' Association of the United States and Canada. The glass blowers disaffiliated from the KOL in 1895 and formed a new, independent union, the Glass Bottle Blowers' Association (GBBA) of the United States and Canada.Denis A. Hayes was elected the new union's president in 1896, a position he held for the next three decades.