Question: When was the bombing for which The Balmoral Furniture Company bombing was thought to be a retaliation for?

Context paragraphs:
Joplin Furniture Company Building: Joplin Furniture Company Building is a historic commercial building located at Joplin, Jasper County, Missouri.  The two original buildings were constructed in 1899 and 1906, and subsequently expanded and combined in 1908 and 1923.  The resulting building is a four-story bearing wall brick masonry building in the Classical Revival style.  The Joplin Furniture Company operated continuously at this location from 1908 to 1982.

McGurk's Bar bombing: On 4 December 1971, the Ulster Volunteer Force (UVF), an Ulster loyalist paramilitary group, detonated a bomb at McGurk's Bar in Belfast, Northern Ireland.  The pub was frequented by Irish Catholics/nationalists.  The explosion caused the building to collapse, killing fifteen Catholic civilians—including two children—and wounding seventeen more.  It was the deadliest attack in Belfast during the Troubles.

Bagby Furniture Company Building: Bagby Furniture Company Building is a historic factory building located at Baltimore, Maryland, United States.  It is a four story, "U"-shaped, brick factory building composed of three sections constructed between 1902 and 1907.  Its exterior features segmental and jack arches above openings, a corbeled watertable, and a corbeled cornice.  It housed the Bagby Furniture Company, which operated from 1879 to 1990.

Natuzzi: Natuzzi Group () is a furniture company founded in 1959 by Pasquale Natuzzi, the group's Chairman, Chief Executive Officer and Group Stylist.  It designs, produces and markets sofas, armchairs and living room accessories.  Natuzzi is Italy's largest furniture house and the company with the greatest global reach in its sector.  In 1993, Natuzzi Group became the only foreign furniture company to list on Wall Street.  It is headquartered in Santeramo in Colle, Apulia, Italy.

Hadley Furniture Company Building: The Hadley Furniture Company Building is a historic retail building at 651-659 Main Street in downtown Worcester, Massachusetts.  The five story brick building was built in 1923-24 to a design by the local architectural firm of Cutting, Carleton & Cutting.  The Hadley Furniture Company, founded in 1914, sought to expand from earlier premises closer to City Hall, and commissioned its construction.  As a representative of a significant specialty retail presence in the city, and for its architectural styling, it was listed on the National Register of Historic Places in 2011.

1971 Balmoral Furniture Company bombing: The Balmoral Furniture Company bombing was a paramilitary attack that took place on 11 December 1971 in Belfast, Northern Ireland.  A bomb exploded without warning outside a furniture showroom on the Shankill Road in a predominantly unionist area, killing four civilians, two of them babies.  It is widely believed that the bombing was carried out by members of the Provisional Irish Republican Army (IRA) in retaliation for the bombing of McGurk's pub a week earlier, which killed 15 Catholic civilians.  The Ulster Volunteer Force (UVF) had carried out that bombing.

Furniture UK: Furniture UK is an e-commerce furniture company that is based in the United Kingdom.  Their online store was launched in 2004 by Simon Davies, and the company delivers their products throughout the country.  They sell furniture across various product ranges, including living furniture, bedroom furniture, home office, hallway furniture, dining furniture, and kitchen furniture.

Widdicomb Furniture Company: Widdicomb Furniture Company was an American furniture company.

Bernhardt Design: Bernhardt Design is an American modern furniture company.  The company was founded in 1983 as a new line of commercial furniture under Bernhardt Furniture Company.  Bernhardt Design is known for working with a wide variety of international designers and for their investment in programs supporting young designers and students.  They sponsor an interdisciplinary course with Art Center College of Design students that allows students the opportunity for their designs to go into production.  Bernhardt Design also sponsors ICFF Studio, a yearly scholarship program that gives young designers exposure at the ICFF Furniture Fair in New York City.

Rhodes Furniture: The Rhodes Furniture Company was a retail furniture company based in Atlanta, Georgia.  Beginning with a single store in downtown Atlanta the company expanded throughout the United States.

Supporting paragraphs: 1971 Balmoral Furniture Company bombing McGurk's Bar bombing
Answer: 4 December 1971