41. Instead of forming the hard rubber material he was looking for, the compound remained slightly gooey to the touch. 42. The Kammer & Reinhardt machine utilized 5-inch hard rubber discs, and some machines and discs were exported to England. 43. The grips are made of hard rubber ( Gutta percha ) and ivory being the only known other original. 44. In 1992, a non-profit " Hard Rubber Music Society " was created as a vehicle for funding the orchestra. 45. It is harvested green, when it is starchy and has a firmness like that of a hard rubber ball. 46. The cube, which had the feel of hard rubber , slipped and dropped toward what at the moment was Jordan's turf. 47. The original power block he designed was essentially a simple winch which used a V-shaped roller coated with hard rubber . 48. She hunkers down and gently strokes the hard rubber track, searching for the raised painted line that marks the starting place. 49. The rigidity of hard rubber at room temperature is attributed to the van der Waals forces between the intramolecular sulfur atoms. 50. Instead of a single hard rubber case, it had two concentric hard rubber cases with a layer of soft rubber between them.
