KO PROPO is a manufacturer of radio control equipment and humanoid robot KHR-1, established in Tokyo, Japan in 1945.

Masami Hirosaka (広坂正美, Hirosaka Masami^?, born February 26, 1970, Kyoto, Japan) is a Japanese radio controlled car driver who is considered to be the world's most successful of all with a record fourteen IFMAR World Championships in 1/12 scale electric, 1/10 scale Pan, 1/10 scale 2WD off road and 1/10 scale 4WD, all electric. He was considered to be one of the highest paid drivers in RC racing, until he retired from the race. his last IFMAR race was 2008 world championship in Thailand. and the retirement ceremony was at May 3, 2009.

Masami was first brought into RC car racing at a young age by his father Masaaki, who was a Yokomo employee. He has been an active participant in radio-controlled racing since the age of seven, and is one of the most popular draws at major R/C racing events; Hirosaka's peers have nicknamed him "Master Masami".

In 1987, during a world championship round for the 4WD off-road at Romsey, England, Hirosaka arrived as a privateer with a Schumacher CAT. He shown promise during practice and was brought into attention by Phil Booth, Schumacher's works driver and was provided a longer wheelbase version version called the CAT XL. Despite being near-stock, Hirosaka managed to win the title.