A recommendation system may use a network of relationships between many different entities to find search results and establish a relevance value for the search results. The transmission has an input shaft driven by the crankshaft and two concentrically journalled output shafts. A low-melting metal coating 13 is formed on contact 12 and two board pieces 2a, 2b are pressed against each other under heating with contacts 12a, 12b thereof being in contact with each other so that thermoplastic resin films 10a, 10b soften to adhere board pieces 2a, 2b to each other and low-melting metal coatings 13a, 13b melt and then solidify to connect contacts 12a, 12b to each other.