PP Inc.
				"A.B.Chance Co. had acquired all of the Porcelain Products, Inc. operations in 1956, circa 1959 the plant at Carey, Ohio was renamed Porcelain Products Co. and markings then reflected this new name." (from Tod).
							U 292
																																1954
								U 292
																																					1951
																																																														1952																							1953
																																																													1957
						U 292
																																																																1952
																																													1951																																								1953
																								1950
																																										1955																																											1957
																									1954
																																																																	1956
					U 292
																																									1950
																					1949																																										1951
																																																																																				1952
																				1953																				1954																																											1956
																																																															1955
																																											1958
																							1957
																	U 285A
																																																						This signal is also displayed on the Knox page
				Characteristics: Color(s) --- cobalt, yellow, white, chocolate brown Pinhole(s) --- glazed Pinhole top(s) --- dome shaped Fire Rested --- petticoat Wet/Dry Processed --- wet Marking(s) --- ink stamped on dome (white or black) "PP/-INC-" in a rectangle over the date of manufacture