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ROBINSON & COX, Solicitors: the following history is sourced from the J. S. Battye Library of West Australian History Collection page for Robinson & Cox
The company was originally registered as Haynes & Robinson and commenced business in the town of Albany. This firm of solicitors has become one the oldest legal firms in Australia in terms of continuity.
The original partner, Samuel Johnson Haynes, was born during the industrial revolution in 1852 in Leek, Staffordshire, England. The family migrated to Victoria where Samuel studied law and in 1886 was admitted to practice in Western Australia.
Robert Thomson Robinson was the first partner taken on by Samuel Johnson Haynes this being in March 1889. This company of solicitors throughout its long history has traded under the following names :
Haynes & Robinson
Haynes, Robinson & Cox
Haynes, Robinson
Sholl & Foulkes
Robinson & Cox
Robinson, Cox & Wheatley
Robinson, Cox, Jackson & Wheatley.
The senior partners of the company were: Robert Thomson Robinson, Charles Baxter Cox, Samuel Johnson Haynes, Richard S. Haynes, Edward Sholl and Herbert Holland Wheatley.

The following historical information is sourced from inHerit, REGISTER OF HERITAGE PLACES - ASSESSMENT DOCUMENTATION for 18-20 Howard Street, Perth
The firm of Haynes, Robinson & Cox, Solicitors, for whom 18 & 20 Howard Street Perth was constructed, originated in a legal partnership established at Albany by Samuel Johnson Haynes and Robert Thomson Robinson (b. 1867, d. 1926) in 1889. In 1897, they took over the practice of Sholl and Foulkes in Perth with C. B. Cox and J. C. Foulkes, which became Haynes, Robinson & Cox in 1903, of which Robinson was the principal partner. The firm later became Robinson, Cox & Wheatley, which continued to retain offices in the original purpose built offices at 18 & 20 Howard Street Perth into the early 1980s. The first floor offices at 20 Howard Street Perth were designed and purpose built as law chambers for Haynes, Robinson & Cox.