Gurgaon-based BTB Marketing Pvt Ltd, which runs a chain of beer bars under the brand The Beer Cafe, has raised an undisclosed sum from Singapore-based RB Investments. Founded by Rahul Singh, the company operates 34 stores in 10 cities including including Mumbai, New Delhi, Chandigarh, Bangalore, Amritsar, Gurgaon, Ludhiana, Mohali, Thane West and Pune.