A multilamp photoflash unit including an elongated plastic housing having a longitudinal channel therein. Within the channel is positioned a thin, flat circuit board to which are connected several (e.g. six) flashlamps arranged in a linear array. The lamps are divided into two opposing pluralities such...http://www.google.de/patents/US4245279?utm_source=gb-gplus-sharePatent US4245279 - Photoflash unit with inverted flashlamps
