Question: Who designed the Hotel at which the 1973 Volvo International was played?

Context paragraphs:
1985 Volvo International: The 1985 Volvo International was a tennis tournament played on outdoor hard courts at the Stratton Mountain Resort on Stratton Mountain, Vermont in the United States and was part of the 1985 Nabisco Grand Prix.  The tournament ran from August 5 through August 12, 1985.

1982 Volvo International: The 1982 Volvo International was a tennis tournament played on outdoor clay courts in North Conway, New Hampshire in the United States and was part of the 1982 Volvo Grand Prix.  The tournament began on July 26, 1982.

1984 Volvo International: The 1984 Volvo International was a tennis tournament played on outdoor clay courts in North Conway, New Hampshire in the United States and was part of the 1984 Volvo Grand Prix.  The tournament ran from July 30 through August 6, 1984.

1983 Volvo International: The 1983 Volvo International was a men's tennis tournament played on outdoor clay courts in North Conway, New Hampshire in the United States and was part of the 1983 Volvo Grand Prix circuit.  It was the 11th edition of the tournament and was held from July 25 through July 31, 1983.

Volvo Philip: Volvo Philip was a concept car built by Volvo in 1952.  It was designed for the American market so it was fitted with a V8 engine producing 120 hp at 4000 rpm and was fitted with whitewall tires and a hint of tailfins.  The design was inspired by US cars and was similar to the 1951 Kaiser.  The designer was Jan Wilsgaard who also designed the Volvo Amazon.  However it was cancelled by the board and never reached production and only one car was made.  That car was used for several years by the board at Bolinder-Munktell in Eskilstuna, and is now preserved at the Volvo Museum in Gothenburg.  This vehicle was handbuilt under extreme secrecy and was subjected to thorough testing.  However, the V8 engine entered production in 1956 and was used for the Volvo Snabbe truck as well as for boats.  It was known for being strong and reliable, but also for a high fuel consumption.  Production of the engine ended in 1973.

1973 Volvo International: The 1973 Volvo International was a men's tennis tournament played on outdoor clay courts at the Mount Washington Resort in Bretton Woods, New Hampshire in the United States.  The event was part of the 1973 Commercial Union Assurance Grand Prix circuit and classified as C category.  The tournament was held from July 23 through July 29, 1973.  Vijay Amritraj won the singles title.

1981 Volvo International: The 1981 Volvo International was a men's tennis tournament played on outdoor clay courts in North Conway, New Hampshire in the United States and was part of the 1981 Volvo Grand Prix.  The tournament ran from July 28 through August 3, 1981.

Mount Washington Hotel: The Mount Washington Hotel is a hotel in Bretton Woods, New Hampshire, near Mount Washington.  It was designed by Charles Alling Gifford.

Volvo International: The Volvo International, also known as the Pilot Pen International, was a professional tennis tournament played on clay courts from 1973 to 1984 and on outdoor hard courts from 1985 to 1998.  It was first held at the Mount Washington Resort in Bretton Woods, New Hampshire in the United States in 1973 after Rod Laver had run a successful summer camp there.  The International was originally part of the Grand Prix tennis circuit until the formation of the ATP Tour in 1990, when it became part of the Championship Series until its dissolution.

1980 Volvo International: The 1980 Volvo International was a men's tennis tournament played on outdoor clay courts in North Conway, New Hampshire in the United States and was part of the 1980 Volvo Grand Prix.  The tournament began on July 27, 1980.

Supporting paragraphs: 1973 Volvo International Mount Washington Hotel
Answer: Charles Alling Gifford